exam Maths Puzzle Numerical Ability

please help

sqrt75t^3+8sqrt108t^3

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exam Other Question

I can not figure out how to write a quadriatic equation where the answer is 3 ax^2+bx+c=0 is the formula

Thanks
Diane Solve this inequalities: 5x - 54 < 36 - 3x (note there is a line under the less than sign)