Question

resolva as equações do 2 grau

x²-8x+12=0
x²+2x-8=0
x²-7x+12=0​

Answer 1

Resposta:

∆ = (-8)² -4. 1. 12 = 0

∆ = 64 -48

∆ = 16

X = -(-8) ± √16 = 0

2.1

X¹ = +8 +4 = 12 ÷ 2 = 6

2

X² = +8 -4 = 4 ÷ 2 = 2

2

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∆ = 2² -4. 1. (-8) = 0

∆ = 4 +32

∆ = 36

X = -(+2) ± √36 = 0

2.2

X¹ = -2 -6 = -8 ÷ 4 = -2

4

X² = -2 +6 = +4 ÷ 4 = 1

4

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∆ = (-7)² -4. 1. 12 = 0

∆ = 49 -48

∆ = 1

X = -(-7) ± 1 = 0

2.1

X¹ = +7 +1 = +8 ÷ 2 = +4

X² = +7 -1 = +6 ÷ 2 = +3