book Maths Puzzle Numerical Ability

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2( square root sign) 75 + square root 3 over 16

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book Other Question

how do i solve the eqation

xsquared + 61x -1422=0
cannot remeber what to do if i cannot factor??/
thank you a rectangle with dimensions of 5 x 8 is inscribed in a circle. what is the area and circuference of this circle?[ inscribed means inside the vertexs touching the edge of the circle].