Question

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$1) (2 x^{3} +x4x)+( x^{3} -3 x^{2} +x)= 2) (5 x^{2} -2ax+ a^{2} )+(-3 x^{2} +2ax- a^{2} )= 3) (2 x^{2} -9x+2)+(3 x^{2} +7x-1)=$

Answer 1

$1)~(2 x^{3} +4x)+( x^{3} -3 x^{2} +x)\to \\\\ 2 x^{3} +4x+x^{3} -3 x^{2} +x \to \\\\ 2x^3+x^3-3x^2+4x+x\to \\\\ \boxed{3x^2-3x^2+5x}\\\\\\\\ 2)~(5 x^{2} -2ax+ a^{2} )+(-3 x^{2} +2ax- a^{2} )\to \\\\ 5 x^{2} -2ax+ a^{2}-3 x^{2} +2ax- a^{2} \to\\\\ 5x^2-3x^2-{\not2ax}+{\not2ax} +{\not a^2}- {\not a^2}\to \\\\ \boxed{2x^2}\\\\\\\\ 3)~(2 x^{2} -9x+2)+(3 x^{2} +7x-1)\to \\\\ 2 x^{2} -9x+2+3 x^{2} +7x-1\to \\\\2x^2+3x^2-9x+7x+3-1\to \\\\ \boxed{5 x^{2} -2x+2}$