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24 February, 10:01

Expand.

If necessary, combine like terms.

(

3

x

+

7

)

(

3

x

-

7

)

=

(3x+7) (3x-7) = left parenthesis, 3, x, plus, 7, right parenthesis, left parenthesis, 3, x, minus, 7, right parenthesis, equals

+1
Answers (1)
  1. 24 February, 10:09
    0
    Answer: 9x^2-49

    Step-by-step explanation: using pattern (a+b) (a-b) = a^2-b^2

    (3x+7) (3x-7) = (3x) ^2-7^2

    =9x^2-49
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