Question

Sabendo que x+y=56 e x-y=5, quanto vale x²-y²? rapido

Answer 1

Knowing that x+y=56 and x-y=5 how much x²-y²?

Answer-

x²-y² = (x+y)(x-y)

According to condition,

x²-y² = (x+y)(x-y)

or, x²-y² = 56×5 {x+y=56 and x-y=5}

or, x²-y² = 280

Hence, x²-y² is equal to 280.