Question

x²+2x-8=0 resposta pfv

Answer 1

A) a=1 b=2 c=-8
x= -b +- √Δ / 2a
Primeiro ache o valor de Δ

Δ= b²-4.a.c
Δ= 2² -4.1.-8
Δ= 4 +32
Δ= 36
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x= -b +- √Δ / 2a
x= -2 +- √36 /2a
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x¹=-2 -6 / 2
x¹= -8 / 2
x¹= -4
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x² -b +- 6 /2
x²= -2 + 6 /2
x²= 4 /2
x²=  2

A resposta da A) é (-4,2)

Answer 2

x=-2+/- √∆ ∆=2×2-4×1×-8
2×1. ∆= 4+32
∆=36
x=-2+/-√36
2

x=-2+/-6
2 -2+6= 4 = 2
2 2

-2-6= -8 = -4
2 2