Answer:
(3x-7)(3x+7)
Step-by-step explanation:
3^2 * x^2 -7^2 (expand that out)
(3x)^2 - 7^2
(3x-7)*(3x+7)
Answer:
(3x+7)(3x-7)
Step-by-step explanation:
Applying the Difference of Two Squares(D.O.T.S) formula:
[tex]x^{2} -y^{2} =(x+y)(x-y)[/tex]
9x²= (3x)²
49=7²
Put 3x as x and 7 as y into the D.O.T.S formula:
(3x+7)(3x-7)
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