Question

Resolva as equações do 2 grau:

a)
${x}^{2} - 49 = 0$
b)
$x .( x - 3) = 5x$
c)
$(x + 1).(x - 3) = - 3$
d)
$(x + 5) ^{2} = 25$
Me ajudem prfv??

Answer 1

a) x²-49=0
x²=49
x=√49
(x=7)=>Resposta

b) x•(x-3)=5x
x²-3x=5x
x²-3x-5x=0
x²-8x=0
x•(x-8)=0

x-8=0
(x=8)=>Resposta


c) (x+1)•(x-3)=-3
x²-3x+x-3=-3
x²-3x+x=-3+3
x²-2x=0
x•(x-2)=0

x-2=0
(x=2)=>Resposta

d) (x+5)²=25
x+5=√25
x+5=5
x=5-5
(x=0)=>Resposta