Question 142864
16x^2 - 81 = 0 
(4x+9)(4x-9)=0
x= +/- (9/4)

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6x - 2 = x^2 
0=x^2-6x+2
0=x^2-6x+9+2-9
7=(x-3)^2
+-sqrt(7)=x-3
{{{3+-sqrt(7)=x}}}

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8x + 4 = 2x^2 
0=2x^2-8x-4

{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
{{{x = (8 +- sqrt( 64-4*2*(-4) ))/(2*2) }}}
{{{x = (8 +- sqrt( 96 ))/(4) }}}
x=2 +/- 4sqrt(6)/4
x=2 +/- sqrt(6)