exam Maths Puzzle Numerical Ability

Given y=3x^2+6x

Please explain the process in steps. Thanks!

A.) find the y-intercept
B.) find the x-intercepts (if any)
c.) find the vertex
D.) Sketch the parabola.

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exam Other Question
x=(a^2+b^2+ab)/(a^2+b^2-ab) ; y=(a+b)/(a-b) find (x^2+y^2)/(x^2-y^2) The vertices of a triangle are P(-1,-1) , Q(2,1), R(3,-1). Find the equation of the altitude of triangle PQR drawn from Q.