Question

[7.07] Choose the correct product of (8x − 4)(8x + 4

Answer 1

go to youtube look up foil method

Answer 2

dan is correct....this requires the FOIL method.
Let me explain....
F -- first numbers
O -- outside numbers
I -- inside numbers
L -- last numbers
(8x - 4)(8x + 4)
F -- multiply the first numbers in each set....8x * 8x = 64x^2
O -- multiply outer numbers in each set ...8x * 4 = 32x
I -- multiply inside numbers of each set ....-4 * 8x = -32x
L -- multiply last numbers in each set ... -4 * 4 = - 16
Now lets put down what we got...
64x^2 + 32x - 32x - 16 (combine like terms)
64x^2 - 16 = 8(8x^2 - 2)