Question

1)2x+5(x-2)²
2)a²-x²+4x-4

Answer 1

$2x+5(x-2)^2=2x+5(x^2-4x+4)=2x+5x^2-20x+20= =-18x+5x^2+20$

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$a^2-x^2+4x-4= =a^2-(x^2-4x+4)=a^2-(x-2)^2=(a+x-2)(a-x+2)$