Question

qual a raiz da equação x²+x =42?

Answer 1

x²+x =42
X^2+X-42=0
a= 1 b=1 c= -42

∆=b^2-4.a.c
∆= 1^2-4.1.(-42)
∆= 1+168
∆= 169

x= -b+-✓∆/2.a
x= -1+-✓169/2.1
x= -1+-13/2

x'= -1+13/2=> +12/2= 6
x"= -1-13/2=> -14/2= -7

A= {6;-7}