SOLUTION: Find a polynomial that has the following characteristics. Show your work. -Its degree is seven. -It has only integer coefficients. -Its zero include -1 as only rational

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Find a polynomial that has the following characteristics. Show your work. -Its degree is seven. -It has only integer coefficients. -Its zero include -1 as only rational       Log On


   



Question 1086482: Find a polynomial that has the following characteristics. Show your work.
-Its degree is seven.
-It has only integer coefficients.
-Its zero include -1 as only rational ones.
-Its zero include 4i (multiplicity 1) and -2root(2)(multiplicity 1).

Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!
-Its degree is seven.
ax%5E7+%2B+bx%5E6+%2B+cx%5E5+%2B+dx%5E4+%2Bex%5E3+%2B+fx%5E2+%2B+gx+%2B+h
-It has only integer coefficients.
a,b,c,d,e,f,g are integers
-Its zero include -1 as only rational ones.
x%5B1%5D=-1
-Its zero include 4i (multiplicity 1) and -2root(2)(multiplicity 1).
x%5B2%5D=4i
x%5B3%5D=-sqrt%282%29
since complex roots and square root always come in pairs, we will have x%5B4%5D=-4i and x%5B5%5D=-sqrt%282%29 too
since we need seven roots, we use x%5B1%5D=-1 three times
and, using zero product theorem we have:

when all multiplied, we get
f%28x%29=x%5E7+%2B+3x%5E6+%2B+11x%5E5+%2B+25x%5E4+-+104x%5E3+-+376x%5E2+-+384x+-+128 which is your polynomial