" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
x^2-(2-x)^2=8
x^2-(4-4x+x^2)=8
x^2-4+4x-x^2=8
4x=12 /:4
x=3
b)
(3x+1)^2-9x^2=7
9x^2+6x+1-9x^2=7
6x=6 /:6
x=1