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Otrada [13]
3 years ago
13

Evaluate using identities( 3x+7) (3x +7)​

Health
1 answer:
mash [69]3 years ago
6 0

Answer:

9 {x}^{2}  + 42x + 49

Explanation:

(3x + 7)(3x + 7)

=  >  {(3x + 7)}^{2}

Using the algebric identity{(a + b)}^{2}  =  {a}^{2}  +  {b + 2ab}^{2}

So,

{(3x + 7)}^{2}  =  {(3x)}^{2}  +  {(7) }^{2}  + 2 \times 3x \times 7

=   9 {x}^{2}  + 42x + 49

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