Question

(2x-3)(2x+3)

Answer 1

FOIL, or recognize the factored form of the difference of squares.

Answer 2

foil

Answer 3

4x^2 +6X-6X -9 ??

Answer 4

First Outside Inside Last?

Answer 5

First terms \(2x*2x = 4x^2\)
Outside terms \(2x*3 = 6x\)
Inside terms \(-3*2x = -6x\)
Last terms \(3*-3 = -9\)

Summing them all we have
\[4x^2 + 6x -6x -9 = 4x^2 - 9\]

Answer 6

Or, with the identity (a+b)(a-b)=a^2-b^2