4.8x^2-3.6=12x

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4.8x^2-3.6=12x4.8x^2-3.6=12x4.8x^2-3.6=12x4.8x^2-3.6=12x4.8x^2-12x-3.6=0x^2-2.5x-0.75=0(x-5/4)^2=34/

4.8x^2-3.6=12x
4.8x^2-3.6=12x

4.8x^2-3.6=12x
4.8x^2-3.6=12x
4.8x^2-12x-3.6=0
x^2-2.5x-0.75=0
(x-5/4)^2=34/16
x-5/4=正负(根34/4)
所以x1:(根34+5)/4
x2:(5-根34)/4