SOLUTION: I can't get this problem right can you show me how to ork it?
Solve by using the quadratic formula. x2 = –5x + 11
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Question 89126: I can't get this problem right can you show me how to ork it?
Solve by using the quadratic formula. x2 = –5x + 11
Found 2 solutions by ankor@dixie-net.com, tutor_paul:
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
Solve by using the quadratic formula. x^2 = –5x + 11
:
Put it in the general form; ax^2 + bx + c = 0
:
x^2 + 5x - 11 = 0
:
In this problem, a=1, b=5, c=-11
:
The quadratic formula:
:
Substitute for a, b, and c, and you have:
:
:
; minus a minus is a plus
:
:
1st solution:
:
:
x = +1.6533
:
2nd solution:
:
:
x = -6.6533
:
It's good idea to check solution by substitution in the original equation:
x^2 = -5x + 11
Substitute 1.6533 for x:
1.6533^2 = -5(1.6533) + 11
2.7334 = -8.2665 + 11
2.7334 ~ 2.7335
:
You can check the solution using the 2nd solution
:
Can you handle this now?
Answer by tutor_paul(519) (Show Source): You can put this solution on YOUR website!
First, re-write the equation in standard form. Standard form is:
So, for your problem the standard form is:
The quadratic equation is:
In your case, a=1, b=5, and c=-11
So plug that in to the quadratic equation:
Simplify:
If you want to simplify this more, just plug the numbers into your calculator. But getting to this point is the important thing!
Good Luck,
tutor_paul@yahoo.com
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