Question

c) J ( x) = x² + 2x - 3​

Answer 1

Explicação passo-a-passo:

∆=b^2-4ac

∆=2^2-4×1×(-3)

∆=4+16

∆=20

x1=-b+√∆

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2a

x1=-2+√20

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2×1

x1=-1+20

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2

x1=19÷2

x1=9.5

x2=-1-20÷2=21÷2=10.5