Question

a + b = to 10 ab= 21 then a cube plus b cube equals to to

Answer 1

hope this helps
god bless u

good morning


cheers

Answer 2

Given,
a+b = 10
ab = 21

We know that,

(a + b)^3 = a^3 + b^4 + 3ab(a + b)

We notice that this identity has the variables whose values we know and also the variables whose value we have to find.

Now we will simply substitute the values into the identity,
(10)^3 = a^3 + b^3 + 3 × 21 × 10
1000 = a^3 + b^3 + 630
a^3 + b^3 = 1000 - 630 = 370