Question

If ab = 5 and a² + b² = 25, then (a + b)2 =?​

Answer 1

35.

Explanation:

a^2 + b^2 = (a + b)^2 - 2ab

Substituting the given values:

25 = (a + b)^2 - 2*5

(a + b)^2 = 25 + 10

(a + b)^2 = 35