Question

(2X+1).(X+2)=3x-7x ao quadrado

Answer 1

(2x+1).(x+2)=3x-7x²
2x²+4x+x+3=3x-7x²
7x²+2x²+4x-3x+x+3=0
9x²+x+x+3=0
9x²+2x+3=0
Δ=b²-4.a.c
Δ=2²-4.9.3
Δ=4-104
Δ= -108
Δ<0 portanto ñ ha raiz