Question

Preciso de ajudar nessas equacoes
A)4x²+8x=0
B)4x²- 400=0
C)20x²+100x=0
D)8x²- 8=0

Answer 1

A) $4( x^{2} +2x)=0$
     $x^{2} + 2x = 0$
        $x (x+2) =0$
           $x=0$e$x = -2$

B) $4 ( x^{2} - 100)=0$
 $x^{2} -100 =0$
$x^{2} =100$
$x=10$ e $x= -10$

C) $20(x^{2}+5x)=0$
$x^{2} +5x=0$
$x(x+5)=0$
$x=0$ e $x=-5$

D) $8( x^{2} - 1)=0$
$x^{2} -1=0$
$x^{2} =1$
$x=1$ e $x=-1$