exam Maths Puzzle Numerical Ability

how would i go about solving this equation

15x^1/2 -1=19

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exam Other Question

8x^6-7x^3y^3-y^6 Solve the problem. Solve the equation 12x to third power - 77x to second power + 91x - 30 = 0 given that 2/3 is a root.