Question

X²+2X+1=7+X não sei resolver

Answer 1

x^2+2x+1=7+x
x^2+x-6=0
Δ=b^2-4ac
Δ=1^2-4*(1)*(6)
Δ=1+24
Δ=25

x=b±√Δ/2a
x'=-1+5/2 ∴ -4/2 ∴-2
x"=-1-5/2 ∴ +6/2 ∴3

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Answer 2

$x {}^{2} + 2x + 1 - 7 - x = 0 \\ x { }^{2} + x - 6 = 0 \\ x {}^{2} + 3x - 2 \times - 6 = 0 \\ x \times (x + 3) - 2( x + 3) = 0 \\ (x + 3) \times (x - 2) = 0 \\ x + 3 = 0 \\ x - 2 = 0 \\ x = - 3 \\ x = 2 \\|$