How do you do this algebraic equation? Is my answer right?

Question

(x squared + 4x - 5) (2x squared -7x +1)

X = - 5

I keep getting weird answers.

Can someone help?

Answer 1

how did you get -5?

it's multiplication right?

I got 2x to the fourth + x cubed - 37x squared + 39x - 5

solution:

(x squared + 4x - 5) (2x squared - 7x + 1)

= 2x to the fourth - 7x cubed + x squared + 8x cubed - 28x squared + 4x - 10x squared + 35x - 5

* rearrange

= 2x to the fourth - 7x cubed + 8x cubed + x squared - 28x squared - 10x squared + 4x + 35x - 5

*combine like terms.

= 2x to the fourth + x cubed - 37x squared + 39x - 5

Note:

what I did is I used distributive property.

*hope this helps