Question

Resolva as equações abaixo.
2x² − 8 = 0
x² − 3x = 0
x² − 25 = 0
7x² − 14x = 0

Answer 1

Explicação passo-a-passo:

$2x^2-8=0\\2x^2=8\\x^2=4\\x=+-\sqrt{4} \\x_1=2\\x_2=-2$

$x^2-3x=0\\x.(x-3)=0\\x=0\\x-3=0\\x=3$

$x^2-25=0\\x^2=25\\x=+-\sqrt{25} \\x_1=5\\x_2=-5$

$7x^2-14x=0\\7x.(x-2)=0\\7x=0\\x=0\\x-2=0\\x=2$