Question

1 utilizando a fórmula Bhaskara resolva as seguintes equações:
a) ×2-4×-5=0....​

Answer 1

x²-4x-5=0

a=1

b= -4

c= -5

∆=b²-4ac

∆=(-4)²-4.1(-5)=16-4(-5)

∆=16-(-20)=36

x= -b±√∆/2a

x= -(-4)+√36/2.1

x=4±√36/2

$x1 = 4 - \frac{ \sqrt{36} }{2} = \frac{4 - 6}{2} = \frac{ - 2}{2} = - 1$

$x2 = 4 + \frac{ \sqrt{36} }{2} = \frac{4 + 6}{2} = \frac{10}{2} = 5$

s€{-1,5}

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