Using suitable identity expand [5x/4+3/4]^3
Answers
Answered by
4
[5x/4+3/4]²
Since (x + y)³ ≡ x³ + 3x²y + 3xy² + y³
And here x = 5x/4 and y = 3/4
= (5x/4)³ + 3(5x/4)²(3/4) + 3(5x/4)(3/4)² + (3/4)³
= 125x²/64 + 9/4 (25x²/16) + 15x/4 (9/16) + 27/64
= 125x²/64 + 225x²/64 + 135x/64 + 27/64
Similar questions