SOLUTION: I need help figuring out this problem. What is the polynomial function? 13i and 5-10i

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Question 691232: I need help figuring out this problem. What is the polynomial function? 13i and 5-10i
Answer by fcabanski(1391)   (Show Source): You can put this solution on YOUR website!
The key is recognizing that complex roots are generated in pairs. So the roots are 13i, -13i, 5-10i, 5+10i. In each case x= the root. Subtract the root from both sides to find the factor.


x=13i so x-13i is the factor. x=-13i so x+13i is the factor. x=5-10i s0 x-5+10i is the factor. x=5+10i so x-5-10i is the factor.


You can multiply the factors together in any way, but generally it's best to multiply the factors based on the like roots together. (x-13i)(x+13i)(x-5+10i)(x-5-10i). Usually this solution is sufficient. But you can multiply the factors.


(x-13i)(x+13i) = x^2 +169. The detailed explanation is after the problem solution. Remember i^2 = -1.


(x-5+10i)(x-5-10i)=x^2 -10x +125


The two factors remaining are those answers (x^2 +169)(x^2 -10x +125)= x^4 -10x^3 +294x^2 -1690x +21125

Hope the solution helped. Sometimes you need more than a solution. Contact fcabanski@hotmail.com for online, private tutoring, or personalized problem solving (quick for groups of problems.)

Solved by pluggable solver: EXPLAIN simplification of an expression
Your Result:


YOUR ANSWER


  • Graphical form: simplifies to
  • Text form: (x-13i)*(x+13i) simplifies to x^2-169*i^2
  • Cartoon (animation) form:
    For tutors: simplify_cartoon( (x-13i)*(x+13i) )
  • If you have a website, here's a link to this solution.

DETAILED EXPLANATION


Look at .
Expanded term %28x%2B13%2Ai%29 by using associative property on %28x-13%2Ai%29
It becomes .

Look at .
Expanded term x by using associative property on %28x%2B13%2Ai%29
It becomes .

Look at .
Reduce similar several occurrences of highlight_red%28+x+%29 to highlight_green%28+x%5E2+%29
It becomes .

Look at .
Expanded term -13%2Ai by using associative property on %28x%2B13%2Ai%29
It becomes .

Look at .
Multiplied numerator integers
It becomes .

Look at .
Reduce similar several occurrences of highlight_red%28+i+%29 to highlight_green%28+i%5E2+%29
It becomes .

Look at .
Eliminated similar terms highlight_red%28+x%2A13%2Ai+%29,highlight_red%28+-13%2Ai%2Ax+%29 replacing them with highlight_green%28+%2813-13%29%2Ax%2Ai+%29
It becomes .

Look at .
Since highlight_red%28+%2813-13%29%2Ax%2Ai+%29 has zero as a factor, it should be replaced with a zero

Look at .
Added fractions or integers together
It becomes .

Look at .
Remove extraneous zero highlight_red%28+0+%29
It becomes .
Result:

Universal Simplifier and Solver


Done!


Solved by pluggable solver: EXPLAIN simplification of an expression
Your Result:


YOUR ANSWER


  • Graphical form: simplifies to
  • Text form: (x-5+10i)*(x-5-10i) simplifies to x^2-10*x-100*i^2+25
  • Cartoon (animation) form:
    For tutors: simplify_cartoon( (x-5+10i)*(x-5-10i) )
  • If you have a website, here's a link to this solution.

DETAILED EXPLANATION


Look at .
Moved -5 to the right of expression
It becomes .

Look at .
Moved -5 to the right of expression
It becomes .

Look at .
Expanded term %28x-10%2Ai-5%29 by using associative property on %28x%2B10%2Ai-5%29
It becomes .

Look at .
Expanded term x by using associative property on %28x-10%2Ai-5%29
It becomes .

Look at .
Reduce similar several occurrences of highlight_red%28+x+%29 to highlight_green%28+x%5E2+%29
It becomes .

Look at .
Expanded term 10%2Ai by using associative property on %28x-10%2Ai-5%29
It becomes .

Look at .
Multiplied numerator integers
It becomes .

Look at .
Multiplied numerator integers
It becomes .

Look at .
Reduce similar several occurrences of highlight_red%28+i+%29 to highlight_green%28+i%5E2+%29
It becomes .

Look at .
Eliminated similar terms highlight_red%28+-x%2A10%2Ai+%29,highlight_red%28+10%2Ai%2Ax+%29 replacing them with highlight_green%28+%28-10%2B10%29%2Ax%2Ai+%29
It becomes .

Look at .
Since highlight_red%28+%28-10%2B10%29%2Ax%2Ai+%29 has zero as a factor, it should be replaced with a zero

Look at .
Added fractions or integers together
It becomes .

Look at .
Remove extraneous zero highlight_red%28+0+%29
It becomes .

Look at .
Expanded term -5 by using associative property on %28x-10%2Ai-5%29
It becomes .

Look at .
Multiplied numerator integers
It becomes .

Look at .
Multiplied numerator integers
It becomes .

Look at .
Eliminated similar terms highlight_red%28+-x%2A5+%29,highlight_red%28+-5%2Ax+%29 replacing them with highlight_green%28+%28-5-5%29%2Ax+%29
It becomes .

Look at .
Eliminated similar terms highlight_red%28+-50%2Ai+%29,highlight_red%28+50%2Ai+%29 replacing them with highlight_green%28+%28-50%2B50%29%2Ai+%29
It becomes .

Look at .
Added fractions or integers together
It becomes .

Look at .
Since highlight_red%28+%28-50%2B50%29%2Ai+%29 has zero as a factor, it should be replaced with a zero

Look at .
Added fractions or integers together
It becomes .

Look at .
Remove extraneous zero highlight_red%28+0+%29
It becomes .

Look at .
Removed extra sign in front of -10
It becomes .

Look at .
Remove unneeded parentheses around factor highlight_red%28+10+%29
It becomes .
Result:

Universal Simplifier and Solver


Done!

Solved by pluggable solver: EXPLAIN simplification of an expression
Your Result:


YOUR ANSWER


  • Graphical form: simplifies to
  • Text form: (x^2+169)*(x^2-10x+125) simplifies to x^(4)-x^(3)*10+294*x^2-1690*x+21125
  • Cartoon (animation) form:
    For tutors: simplify_cartoon( (x^2+169)*(x^2-10x+125) )
  • If you have a website, here's a link to this solution.

DETAILED EXPLANATION


Look at .
Expanded term %28x%5E2-10%2Ax%2B125%29 by using associative property on %28x%5E2%2B169%29
It becomes .

Look at .
Expanded term x%5E2 by using associative property on %28x%5E2-10%2Ax%2B125%29
It becomes .

Look at .
Reduce similar several occurrences of highlight_red%28+x%5E2+%29 to highlight_green%28+x%5E%282%2B2%29+%29
It becomes .

Look at .
Reduce similar several occurrences of highlight_red%28+x%5E2+%29 to highlight_green%28+x%5E%281%2B2%29+%29
It becomes .

Look at .
Added fractions or integers together
It becomes .

Look at .
Added fractions or integers together
It becomes .

Look at .
Expanded term 169 by using associative property on %28x%5E2-10%2Ax%2B125%29
It becomes .

Look at .
Multiplied numerator integers
It becomes .

Look at .
Multiplied numerator integers
It becomes .

Look at .
Eliminated similar terms highlight_red%28+x%5E2%2A125+%29,highlight_red%28+169%2Ax%5E2+%29 replacing them with highlight_green%28+%28125%2B169%29%2Ax%5E2+%29
It becomes .

Look at .
Added fractions or integers together
It becomes .

Look at .
Remove unneeded parentheses around factor highlight_red%28+294+%29
It becomes .
Result:

Universal Simplifier and Solver


Done!

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