Question

(b) find the product using suitable identity (3x + 4) (3x - 5)

Answer 1

Answer:

9x^2-3x-20

Step-by-step explanation:

(x+a)(x+b)=x^2+(a+b)x+ab

(3x + 4) (3x - 5)=(3x)^2+(4-5)(3x)+(4)(-5)

=9x^2+(-1)(3x)+(-20)

=9x^2-3x-20