exam Maths Puzzle Numerical Ability

Find the x-intercepts.
y = x^2 + x - 9

I am a little confused on how to find the x intercepts, I am familiar with finding they Y-intercepts but I am not understanding the x-intercepts. Please help. Thanks.

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exam Other Question

Find y as a function of x. The constant Cis a positive number.
ln(y-3)=ln 2(x^2)+ln C I really need help with these problems if any tutor can help please do i have been waiting for a few hours now i'm reposting them thanks to anyone who helps.

1) F(x)= 4x^4+8x^3-