exam Maths Puzzle Numerical Ability

Please help me solve this equation:

squareroot2x-3 -3=0

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exam Other Question

If F(x)= 3X to the 3rd power -6X to the 2nd power - x + 7, what is the value of f(2) + f(-2)?

This question is multiple choice, it is either A. -34, B. 0, C. 2, D. 7, E. 14 Solve algebraically and check your potential solutions show work
squareroot x+20-x=0