book Maths Puzzle Numerical Ability

x^3+x^2+ sqrt(x^2+3x)=6

I've tried to square both sides, I've tried setting the equation equal to 0, I've tried to factor out x^2+x, I'm just at a loss.

Thanks for your help!

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book Other Question

Write the letter corresponding to the equation of the line with x-intercept (-9, 0) and undefined slope.

A) y = -9x

B) y = -9

C) x = 0

D) x = -9

Three students are standing at different places on the playground. Sally is at the swings and Jimmy is 5 feet belowo her at the see-saw. kathy is 12 feet left of Jimmy at the jungle gym. How far is Kathy form Sally? (hint: draw a picture first.)