exam Maths Puzzle Numerical Ability

How do I solve 3+ (square root of) x^2-8x = 0 ? Please note I do not know how to put the square root sign, but x^2-8x is under the square sign.

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exam Other Question

q.1, -7 + x = 22
q.2, - 2x = -54
q.3, solve for m f= 1/2 mv
q.4 solve then graph= t + 13 > 8
q.5 solve {x} + 8 =9
q.6 2x - 1/9 = 5
q.7 graph y=1/2x
q.8, graph y= x2 + 4
q. i^41(book answer is i. I need help how to simplify)