exam Maths Puzzle Numerical Ability

Having trouble with this problem: (8x+5)^2 = 16 I need to solve this using the square root property. PLEASEEE HELP!!! I have spent hours!

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exam Other Question

solve the inequalities
6(2x - 1) + 3 < x + 7
i have to use synthetic diision . (2x^4-5x^3-50x+1) divided by (x-4). I have no clue where or how to insert zeros.