Question

a)
(x+1)(x+2)-(x+3)(x+4)=0
b)
10x^2-(2x-3)(5x-1)=31

Answer 1

а)х2+3х +2 - х2-7х-12=0
-4х-10 = 0
4х=-10
х=-10/4
х=2,5
б) 10х2 - 10х2 +17х -3=31
17х=34
х=34/17
х=2