(x+5)×(x+5)-(x+1)×(x+1)=48

Question

(x+5)×(x+5)-(x+1)×(x+1)=48

Answer 1

Раскроем скобки. 
x^2 +5x + 5 x +25 - (x^2 +x + x +1) = 48
x^2-x^2 +8x +24 = 48
8x+24 = 48
8x = 24
x= 24/8
x=3

Comments

Огромное спасибо)