Expand $(3x + 7)(-3x + 7)$.
(N/A) To expand the expression $(3x + 7)(-3x + 7)$,we can rearrange the terms to use the algebraic identity $(a + b)(a - b) = a^2 - b^2$.
First,rewrite the expression as $(7 + 3x)(7 - 3x)$.
Here,$a = 7$ and $b = 3x$.
Applying the identity: $(7)^2 - (3x)^2 = 49 - 9x^2$.
First,rewrite the expression as $(7 + 3x)(7 - 3x)$.
Here,$a = 7$ and $b = 3x$.
Applying the identity: $(7)^2 - (3x)^2 = 49 - 9x^2$.
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