Question

Exercícios
1) (VALOR 0,6)Resolva as equações e encontre as
raízes:
a) x² - 8x = 0
b) 2x2 - 10x=0
c) 4x2 + 40x = 0
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Answer 1

$\tt{a)} </p><p>~\sf{x^2-8x=0}\\\sf{x(x-8)=0}\\\sf{x=0}\\\sf{x-8=0\implies x=8}\\\tt{b)}~\sf{2x^2-10x=0}\\\sf{2x(x-5)=0}\\\sf{2x=0\implies x=\dfrac{0}{2}=0}\\\sf{x-5=0\implies x=5}\\\tt{c)}~\sf{4x^2+40x=0}\\\sf{4x(x+10)=0}\\\sf{4x=0\implies x=\dfrac{0}{2}=0}\\\sf{x+10=0\implies x=-10}$