Question

como calcular (x+1)^2=7+x ??

Answer 1

(x+1)²=7+x
(x+1)(x+1)=7+x
x²+2x+1-7-x=0
x²+x-6=0
a=1 b=1 c=-6
b²-4ac
1²(-4)(a)(c)
Δ=1(-4)(1)(-6)
Δ=25

x=-b+-√Δ/
     ----------
        2.a

x'=-1+5/2 = 2
x''=-1-5/2 = -3

As raizes da equação x'=2 x''=-3