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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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14y ago

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