I need this problem solved, please.
2 Answers By Expert Tutors
(4x - 7)(4x + 7)
(4x)(4x) + (4x)(7) - 7(4x) - (7)(7)
16x2 + 28x - 28x - 49
16x2 - 49
There is a pattern here. (A+B)(A-B)=A2-AB+AB-B2=A2-B2, You should remember it, it's really handy.
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