10b+2-20b^2-10b
-1/5=-0.2
10*(-0.2)+2-20*(0.04)-10*(-0.2)=-2+2+0.8+2=2.8
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10b+2-20b^2-10b
-1/5=-0.2
10*(-0.2)+2-20*(0.04)-10*(-0.2)=-2+2+0.8+2=2.8