Question

si a+b=7 y a2+b2=25 calcular a-b
(a+b)2+(a-b)=2(a2+b2)

Answer 1

Explicación paso a paso:

(a+b)=7

(a²+b²)=25

(a-b) = ?

(a+b)²+(a-b)=2(a²+b²)

7² + (a-b) = 2*25

49 +(a-b) = 50

(a-b) = 50 - 49

(a-b) = 1