Question

Find the missing coefficient

Answer 1

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`