You mean factor
= 5 (x-2)(x+2)
first one is "grouping"
= a(2x+3y) - b(2x+3y)
second, common factor then difference of squares
= 5(x^2 - 4)
third, general quadratic
looks like you got your answer by
adding 3x^2 + 4x to get 7x^3
that is just unforgivable!
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