1.

DC(b) From the sum of 4 + 3x and 5 - 4x + 2x', subtract the sum of 3 - 5x and1 +21+5.

Answer»

sum1=4+3x + 5-4x+2x^2=9-x+2x^2sum2=3x^2 - 5x + (-x^2 + 2x +5)=2x^2-3x+5sum1 - sum2=9-x+2x^2 -(2x^2 -3x+5)=2x+4=2(x+2)

4 + 3x + 5 -4x + 2x^2 = 2x^2 - x +9; sum2 ; 3x^2 -5x +(-x^2+2x+5) = 3x^2-x^2-5x+2x +5=2x^2-3x+5; sum1 - sum2 = 2x^2-x + 9 -2x^2 +3x -5=2x +4 = 2( x+2)



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