Question

d) x2 - 5x + 4 = 0
Alguém?

Answer 1

Resposta:

4 e 1

Explicação passo-a-passo:

$x^2 - 5x + 4 = 0$

Pelo método de baskhara

$\Delta = b^2 - 4ac\\\Delta = 25 - 4.4\\\Delta = 25 - 16\\\Delta = 9\\\\\frac{-(-5) \± \sqrt{\Delta}}{2}\\\\\frac{-(-5)\±\sqrt{9}}{2}\\\\\frac{+5\±3}{2} =\\\\\frac{+5-3}{2}= \frac{2}{2} = 1\\\\\frac{+5+3}{2} = \frac{8}{2} = 4$