Question

Efectuează ecuaţia:x*x+2x=143

Answer 1

x² +13x -11x-143=0
x(x+13) - 11(x+13)=0
(x+13)(x-11)=0
x+13=0
x=-13
x-11=0
x=11 ⇒x∈{-13,11}