Question

Dada a expreção :
x = -7+√-7²-4.1.10
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2.1
qual o valor de x?

Answer 1

x = $\frac{- 7 + \sqrt{-7 ^{2}- 4(1)(10) } }{2(1)}$

x = $\frac{-7 + \sqrt{49 - 40} }{2}$

$x = \frac{-7 + \sqrt{9} }{2}$

x = $\frac{-7 + 3 }{2}$

x = $\frac{-4}{2}$

$x = -2$