Question

(A) X²-64=0
(B) x(x+2) = 5x
(C) x²+2x+3=0

Answer 1

x^2= 64
x= +- raiz quadrada de 64
x= +- 8.

x^2+2x= 5x
x^2= 5x-2x
x^2= 3x
x= +-raiz quadrada de 3x.


x^2+2x+3= 0
a= 1
b= 2
c= 3

delta= b^2-4.a.c
2^2-4.1.3
4-12
-8.
(sem raízes reais.).