exam Maths Puzzle Numerical Ability

what is the equation of the parabola with the vertex form with 0,0 passing through 3,3 point

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Multiply and simplify, I need help!

6x^2-11x-21 x^4-81
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5x^2+8x-21 x^2-6x+9
I need help solving exponetial inequalities using logartihms. i can get to this step- 2nlog8=4n+3log52.