i need this answer to factor this equation 5x^2-20x+20=0
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Simplify the equation: x²-4x+4=0=(x-2)² (dividing through by 5).

ab=100, a+b=-20 so a(-20-a)=100, substituting for b.

-20a-a²=100, a²+20a+100=0=(a+10)², a=-10=b.

 

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