№1
p₁(x)=5x²-4x+1
p₂(x)=6x²+x-3
p₁(x)+p₂(x)=5x²-4x+1+6x²+x-3=11x²-3x-2
p₁(x)-p₂(x)=5x²-4x+1-6x²-x+3=-x²-5x+4
№2
x²+(5x-2)-(3x+1)=3x+x²
x²+5x-2-3x-1=3x+x²
5x-3x-3x=x²-x²+1+2
-x=3
x=-3
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Verified answer
№1
p₁(x)=5x²-4x+1
p₂(x)=6x²+x-3
p₁(x)+p₂(x)=5x²-4x+1+6x²+x-3=11x²-3x-2
p₁(x)-p₂(x)=5x²-4x+1-6x²-x+3=-x²-5x+4
№2
x²+(5x-2)-(3x+1)=3x+x²
x²+5x-2-3x-1=3x+x²
5x-3x-3x=x²-x²+1+2
-x=3
x=-3