Question

a la a doua - b la a doua =52 si a+b=13.Atunci a-b=?

Answer 1

a²-b²=52
(a-b)(a+b)=52
13(a-b)=52
=>a-b=52:13
a-b=4

Answer 2

a^2-b^2=(a-b)(a+b) 13*(a-b)=52 a-b=52:13 a-b=4