Question 622808
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Hi,
how I solve this equation:
{{{6x^2 + x^2 = (18-x)^2 = (18-x)(18-x)}}}
I.  Expand
II. combine like terms and 
III. set to Zero
IV.  Use Quadratic formula {{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
 7x^2 = 324 - 36x +x^2  etc