Question

помагите пжпжпжпжппжпд​

Answer 1

Номер 1:

$p_{1}(x)+ p_{2}(x)=(5x^{2}-4x+1)+(6x^{2}+x-3)=5x^{2}-4x+1+6x^{2}+x-3=11x^{2}-3x-2\\p_{1}(x)- p_{2}(x)=(5x^{2}-4x+1)-(6x^{2}+x-3)=5x^{2}-4x+1-6x^{2}-x+3=-x^{2}-5x+4$

Номер 2:

$x^{2} +(5x-2)-(3x+1)=3x+x^{2} \\x^{2} +5x-2-3x-1=3x+x^{2}\\x^{2} +5x-2-3x-1-3x-x^{2}=0\\-x-3=0\\-x=3\\x=-3$