Question

Me ajudem por favor

X^2+x-7=5

Answer 1

X²+x-7=5
X²+x-7+5=0
X²+x-12=0
∆=b²-4.A.C
∆=1²-4.1.(-12)
∆= 49
X'= -1+√49/2.1
X'= 4
X''=-1-√49/2.1
X''=-1-7/2
X''= -4