(3x+2)(4x-1)-12=x(10+11x)

Question

(3x+2)(4x-1)-12=x(10+11x)

Answer 1

( 3х + 2 )( 4х - 1 ) - 12 = х( 10 + 11х )
12х^2 - 3х + 8х - 2 - 12 = 10х + 11х^2
12х^2 + 5х - 14 - 11х^2 - 10х = 0
Х^2 - 5х - 14 = 0
D = 25 + 56 = 81 = 9^2
X1 = ( 5 + 9 ) : 2 = 7
X2 = ( 5 - 9 ) : 2 = - 2