Question

Is the expression (a+b)^2 is always equal to a^2+b^2?

Answer 1

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

Answer 2

not correct

Explanation:

(a + b)²

= (a + b)(a + b) ← expand using FOIL

= a² + ab + ab + b²

= a² + 2ab + b²

thus

(a + b)² = a² + 2ab + b²