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Find the missing coefficient

Find the missing coefficient-example-1

1 Answer

5 votes

Answer:

The missing coefficient is -8

Explanation:

Let

a------> the missing coefficient

we have


ay^(2)-[-5y-y(-7y-9)]-[-y(15y+4)]=0


ay^(2)-[-5y+7y^(2)+9y]-[-15y^(2)-4y]=0\\ \\ ay^(2)+5y-7y^(2)-9y+15y^(2)+4y=0\\\\ay^(2)-7y^(2)+15y^(2)=0\\\\ay^(2)+8y^(2)=0\\ \\a=-8

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