Question

(х+6)²=(х+9)²

(х+6)²+(х+3)²=2х²

Answer 1

x²+12x+36+x²=x²+18x+81
x²+12x-x²-18x=81-36
-6x=45
x=-7.5


x²+12x+36+x²+6x+9=2x²
x²+12x+x²+6x-2x²=-36-9
18x=-45
x=-2,5