Question

Q. No.24. Multiply and verify the result
(i) (3a + 2b) (3a - 2b): a = -1, b = 2​

Answer 1

Step-by-step explanation:

(a+b)(a-b)=a^2-b^2 identity

3a+2b)(3a-2b)=3a^2-4b^2

a=-1,b=2

3×(-1)^2-(4×(2)^2)

3-16=-13