exam Maths Puzzle Numerical Ability

Please help me find the Domain of this equation.

h(x)=x^3-4x+5

Thanks in advance

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exam Other Question

Determine whether the following equations have a solution or not? Justify your answer.
2x2 + x - 1 = 0 Can someone help me on this problem?

I need to solve this literal equation for the indicated variable as follows:

A = 1/2h (B + b) (for b) Area of a trapezoid

Thanks,
Sher