Question

Using suitable identy ,find (a+3) (a+2)

Answer 1

(a+3)(a-3)(a^2+9)

(a^2-3^2)(a^2+9) <(a+b)(a-b)>

(a^2-9)(a^2+9)

[(a^2)^2]-9^2

a^4-81 (ans)

Answer 2

Answer:

Identity: (x+a)(x+b)

= $x^{2}$ + x(a+b) + ab

x= a

a= 2

b= 3

= $a^{2}$ + a (2+3) + 2*3

=$a^{2}$ + 5a +6