exam Maths Puzzle Numerical Ability

how do you find the solution of the x when the equatins are like this..
2x^3+5x-7= 0 plz tell me step by step so i can try it with other problems.

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exam Other Question

graph f(x0 = 3X = 2 ok I think we first have to solve for x Suppose X ~(10,5).

P(X greater than or equal too 15)
P(0 less than or equal to X less than or equal to 20)
P(|X| < 12)