Question

1. (2a + 7) (2a – 7)
2. (b – 7)^2​

Answer 1

Step-by-step explanation:

(2a-7)² will be the ans hope it helps

and no. 2( b+7)(b-7)

Answer 2

$\huge \colorbox{aqua}{Answer}$

$\rm1.(2a + 7)(2a - 7) \\ \\ \rm\red {using \: identity } \\ \\ \rm \red{ {a}^{2} - {b}^{2} = (a + b)(ab) } \\ \\ \rightarrow \rm(2a + 7)(2a - 7) = (2a {)}^{2} - ( 7{)}^{2} \\ \\ \rightarrow \rm4 {a}^{2} - 49$

$\rm2. \: (b - 7 {)}^{2} \\ \\ {\red {\rm { using \: identity}}} \\ \\ {\red { \rm{(a - b {)}^{2} = {a}^{2} + {b}^{2} - 2ab}}} \\ \\ \rightarrow \rm(b - 7 {)}^{2} = (b {)}^{2} + ({7)}^{2} - 2(b \times 7) \\ \\ \rightarrow \rm{ {b}^{2} + 49 } - 14b$

Hope it helps you...☺️

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