Question

quantos q é x²+x-12=0

Answer 1

a= 1
b= 1
c= -12
∆= 1 -4×1×(-12)
∆= 1 +48
∆=49
x= - 1 + - √49 ÷2
x= -1 + - 7 ÷2
x'= -1+7÷2= 6÷2= 3
x''= -1-7÷2= -8÷2= - 4

s={3}