Question

como resolver isso: (x+1) . (x-2) igual -7x - 10
e essa : (x-1) . (2x+3) igual a 0

Answer 1

1) (x+1)(x-2)=-7x-10
x²-2x+x-2=-7x-10
x²-2x+x-2+7x+10=0
x²+6x+8=0
 coeficientes= a=1 b=6 c=8
delta=b²-4ac
delta=6²-4.1.8
delta=36-32=4

bhaskara
x=-b+-√Δ/2a                    x''=-6-2/2
x=-6+-√4/2                      x''=-8/2
x'=-6+2/2                         x''=-4
x'=-4/2
x'=-2
s={-2,-4}