Question

expand (4x+8y)³. please solve​

Answer 1

Answer:

64x³ + 512y³ + 384x²y + 768xy²

Step-by-step explanation:

We know the identity,

$(a + b)^3 = a^3 + b^3 + 3ab(a+b)\\= (4x)^3 + (8y)^3 + 3(4x)(8y)[4x +8y]\\= 64x^3 + 512y^3 + 96xy[4x + 8y]\\= 64x^3 + 512y^3 + 384x^2y + 768xy^2$