Question

Expand: i. (3x+2)2 ii. (5a-3b)2​

Answer 1

Answer:

ii) 25a²+9b³–30ab

I) 9x²+12x+4

Step-by-step explanation:

(a+b)²= a²+b²+2ab

(a–b)²= a²+b²–2ab

(I) (3x+2)²= (Here, a= 3x and b= 2)

(3x)²+(2)²+(2×3x×2)

= 9x²+4+12x

= 9x²+12x+4

(ii) (5a)²+(3b)²–(2×5a×3b)

=25a²+9b³–30ab