Question

simplify (a+b)^2 - (a-b)^2​

Answer 1

Answer:

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

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

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

(a+b)^2 - (a-b)^2 = 4*a*b