Сократить дробь x2+2x-3/2x+6

Question

Сократить дробь x2+2x-3/2x+6

Answer 1

x2+2x-3/2x+6 =
= (x-1)(x+3) / 2 (x+3) =
= (x-1) / 2

x2+2x-3=0
D = 2^2 - 4*1*(-3) = 4 + 12 = 16 = 4^2
x =  -2 + 4 / 2 = 2/2 = 1
x = - 2 - 4 / 2 = -6/2 = -3