Question

(7x+8y)3 Expand Formulae

Answer 1

Step-by-step explanation:

(7x+8y)3

=3×7x+3×8y

=21x+24y

Answer 2

Answer:

Let us simplify the expression, we get

(7x + 8y)3 = (7x)3 + [ 3 × (7x)2 × (8y)] + [ 3 × (7x) × (8y)2 ] + (8y)3

By using the formula,

(a + b)3 = a3 + 3a2b + 3ab2 + b3

Here a = 7x, b = 8y

Now, substitute the value we get

= 343x3 + (3 × 49 × 8)x2y + (3 × 7 × 64)xy2 + 512y3

= 343x3 + 1176x2y + 1344xy2 + 512y3

∴ (7x + 8y)3 = 343x3 + 1176x2y + 1344xy2 + 512y3