Question

Using identities expand (5x/2+3/4)whole cube

Answer 1

Answer:

we know that (a+b) ³ = a³+b³ + 3a²b + 3ab²

putting it in formula we get

(5x/2) ³+(3/4) ³+3(5x/2) ²(3/4) + 3 (5x/2) (3/4) ²

= 125x³/8 + 27/64 + 3× (25x²/4) ×3/4 + 3× 5x/2×(9/16)

= 125x³/8+27/64 + 225x²/4 + 135x/32 is answer