Question

Find the product: (8x^2 – 5y) (8x^2 + 5y)

Answer 1

FOIL

Answer 2

i know to use foil but i dont understand how

Answer 3

constants multiply together, as for like variables with exponents >>>
x^y * x^z = x^y+z

Answer 4

so the first part in the FOIL operation is (8x^2)(8x^2) = 64x^4

Answer 5

ok so when it comes time to put them together do i subtract? for instance the 64x^4 - (number) ?

Answer 6

depends, the second part is (8x^2)(5y) which is a positive number so you would add that. the third part however, (-5y)(8x^2) is a negative number so you subtract

Answer 7

thank you! that confused me but i think that makes a little more sense!

Answer 8

np