Question

Can someone help me by simplifying the equation (5x-7)(9x^2-4x-8)

Answer 1

$(5x - 7) * (9x^2 - 4x - 8)$

1.) Try using the FOIL method (First*first, outside*outside, inside*inside, last*last):

$(5x)(9x^2) + (5x)(-4x) + (5x)(-8) + (-7)(9x^2)$

2.) Multiply the bases and add the exponents:

$45x^3 - 20x^2 - 40x - 63^2 + 28x + 56$

3.) Look for the variables without exponents:

$-40x + 28x$ = 28x

$45^3 - 83x^2 - 12x + 56$