write the following equation in the form ax2+bx+c=0 form :y2-9=13y
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( identity : (a-b)² = a²-2ab +b²)
= {(2x - 5y)}^{2}=(2x−5y)
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= {(2x)}^{2} - 2(2x)(5y) + {(5y)}^{2}=(2x)
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−2(2x)(5y)+(5y)
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= 4 {x}^{2} - 20xy + 25 {y}^{2}=4x
2
−20xy+25y
2
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