Question

find the product and verify the result for a=2,b=1

Answer 1

3(2×2×2)(1×1)+3(2×2×2×2)(1)+4(2×2)×1+4(2×2×2)
3×8×1+3×16×1+4×4×1+4×8
24+48+16+32
120.

Hope this will help you.
This is bueaty queen - Janhvi.