exam Maths Puzzle Numerical Ability

Please help me solve this equation:

the square root of 8x+9=5

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exam Other Question

True or False: {[a, b^2] : a, b is an element of R}is a subspace of R^2. Please show ALL step so that I can do it myself next time. Thank you. 5 sqrt 6 x 2x sqrt 6

can someone show how to simplify this