Question

resolva as equaçoes na forma Ax2+bx+c=0
a] X2+3x-10=0

Answer 1

Resolução:
ax² + bx + c = 0

a) x² + 3x -10 = 0

a = 1
b = 3
c = -10

Δ = b² - 4.a.c
Δ = 3² - 4.1.(-10)
Δ = 9 + 40
Δ = 49

x = $\frac{-b+/- \sqrt{A} }{2.a}$

$x = \frac{-3+/- \sqrt{49} }{2.1}$

$x= \frac{-3+/-7}{2}$

$x`= \frac{-3+7}{2}$

$x`=2$

$x``= \frac{-3-7}{2}$

$x``=-5$

$S={-5,2}$

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