Question

(x^2 + 2x - 1)(x^2 + 2x + 5)

Answer 1

unfortunatly i dont think that is right lol, but thank you for helping

Answer 2

you have to do 3 times 3 = 9 multiplications, so be prepared to write

Answer 3

first multiply everything in the second parentheses by \(x^2\) then by \(2x\) and then by -1
finally combine like terms

Answer 4

I just need a solution

Answer 5

(x^2 + 2x - 1)(x^2 + 2x + 5)
=x^2(x^2-2x-1) + 2x(x^2+2x-1)+5(x^2+2x-1)
=x^4 -2x^3-x^2+2x^3+4x^2-2x+5x^2+10x-5
=x^4-2x^3+2x^3+4x^2-x^2+5x^2+10x-2x-5
=x^4+8x^2+8x-5

Answer 6

if you just need a solution, why post here? use this
http://www.wolframalpha.com/input/?i=%28x^2+%2B+2x+-+1%29%28x^2+%2B+2x+%2B+5%29
look at "alternate form" and it will be error free

Answer 7

or use it to check the answer
as you can see hero has it correct

Answer 8

I don't have it correct. I made a mistake

Answer 9

(x^2 + 2x - 1)(x^2 + 2x + 5)
=x^2(x^2+2x-1) + 2x(x^2+2x-1)+5(x^2+2x-1)
=x^4 +2x^3-x^2+2x^3+4x^2-2x+5x^2+10x-5
=x^4+2x^3+2x^3+4x^2-x^2+5x^2+10x-2x-5
=x^4+4x^3+8x^2+8x-5

Answer 10

thank you!