Question

find the value using identity (a) (x+3). (x+3). (B). (7a-9b) (7a-9b)​

Answer 1

Answer:

Question :-

find the value using identity

Required Answers :-

(a) (x+3). (x+3).

Formula used :-

(a+b)(a+b) = a²+2ab + b²

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

$= {x}^{2} + 6x + 9$

(b) (7a-9b) (7a-9b)

Formula used :-

(a-b)(a-b) = a²-2ab + b²

$(7a - 9b)(7a - 9b) = {7a}^{2} - 2 \times 7a \times 9b + {9b}^{2}$

$= 49 {a}^{2} - 126ab + 81 {b}^{2}$