from the sum of x²+x+1 and x²-x+1 subtract-1/2 x²-2/3x+12
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Step-by-step explanation:
sum of( x²+x+1) and (x²-x+1) is
x²+x+1+x²-x+1
= 2x²+2
if 2x²+2 substract from -1/2x² -2/3x+12 then
= -1/2x²-2/3x+12-(2x²+2)
= -1/2x²-2/3x+12-2x²-2
= -(2+1/2)x²-2/3x+10
= - 5/2x²-2/3x+10
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