Question

If a + 2b = 5, prove that a3 + 8b^3 + 30ab = 125.​

Answer 1

Answer:BRO whole cube both side

Step-by-step explanation:

(a+2b)³=(a)³+(2b)³+3a(2b)(a+2b)

Answer 2

Answer:

Step-by-step explanation:

Given that a + 2b = 5

We have to find a^3 + 8b^3 + 30ab

Now consider the cube of a + 2b

(a + 2b)^3 = a^3 + (2b)^3 + 3*a*2b*(a + 2b)

= a^3 + 8b^3 + 6ab * (a + 2b)

53 = a^3 + 8b^3 + 6ab + 5

125 = a^3 + 8b^3 + 30ab