exam Maths Puzzle Numerical Ability

Determine whether the following equations have a solution or not? Justify your answer.
4/3x2 - 2x + 3/4 = 0

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exam Other Question

Given f(x) = -x - 4, find f(a - 3) the equation is

radical 3x + radical 12= x+3/radical 3

I'm not sure if I could take out the fraction since it has a radical in it.