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Best Answer
320 = 2x^2 + 12x
0 = 2x^2 +12x -320
Using the quadratic formula
x = (-12 + sqr(144+4*2*320))/4 and
x= (-12 - sqr(144+4*2*320))/4
x =( -12 + sqr(2560))/4 = 9.649 to 3 d.p.
and x=(-12 - sqr(2560))/4 = -15.649 to 3 d.p
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