Step-by-step explanation:
a=(x + 3)
b=2x
c=(2x + 2.4)
(x + 3)^2 + 2x^2 = (2x + 2.4)^2
=3x^2 + 6x + 9 = 4x^2 + 9.6x +5.76
= -x^2 - 3.6x + 3.24 = 0
now we have a quadratic equation so
a= -x
b= -3.6
c= 3.24
[tex]x=[/tex][tex]-\frac{3.6 + \sqrt{25.92} }{2}[/tex] , [tex]x=\frac{\sqrt{25.92} -3.6}{2}[/tex]
