Question

using suitable identy find (x+3) (x+7) ​

Answer 1

Step-by-step explanation:

(x + 3)(x + 7)

∵ (x + a)(x + b) = x2 + (a + b)x + ab

∴(x + 3)(x + 7) = x2 + (3 + 7)x + 3 x 7

= x2 + 10x + 21

Answer 2

formula if x²+(a+b)x+ ab

x²+(3+7)x+3×7

x²+10x+21