Question

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Answer 1

Resposta:

Explicação passo a passo:

∆=64 + 40=104 ==> √∆= 2√26

x'= 8+2√26/2 = 4+√26. ✓

x''= 8-2√26/2 = 4-√26. ✓

Answer 2

Explicação passo-a-passo:

$x {}^{2} - 8x - 10 = 0$

a=1, b= -8 e c=-10

delta = b²-4ac

delta =(-8)²-4.1x-10=64+100=164

$\sqrt{164} = 12.81</p><p>[tex]x1 = \frac{ - ( - 8) +12.81 }{2} = \frac{8 + 12.81}{2} = \frac{20.81}{2} = 10.405$

$x2 = \frac{ - ( - 8) - 12.81}{2} = \frac{8 - 12.81}{2} = \frac{ - 4.81}{2} = - 2.405$