Question

Resolva as equações do segundo grau

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Answer 1

h)$x^{2}$-$\frac{7}{2}$x + 3

Δ= $\frac{7}{2} ^{2}$- 4(3)

Δ = $\frac{49}{4}$- 12

Δ = $\frac{49 - 48}{4}$

Δ = $\frac{1}{4}$

$\sqrt{Δ}$ = $\frac{1}{2}$

x1 = $\frac{7}{2}$ + $\frac{1}{2}$

        2

x1= $\frac{8}{2}$

     2

x 1 = $\frac{4}{2}$

x2 = $\frac{7}{2}$ - $\frac{1}{2}$

         2

x2 = $\frac{6}{2}$

       2

x2 = $\frac{3}{2}$

i) 7$x^{2}$= 35

$x^{2}$= 5

x =± $\sqrt{5}$