exam Maths Puzzle Numerical Ability

I do not understand how I am suppose to solve this.
Solve by using the Square Root Property
(x-5)^2=7

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exam Other Question

Find the polynomial f(x) of degree three that zeroes at 1, 2, and 4 such that f(0)=-16.

Thank you! Question

a) Given PRS and PQR are triangles. QR = 30 cm. Find PS.
b) PTQ, PMR and PMS are all triangles. PS = QR while PQ = RS. PQ = 24 cm while RS = 24 cm. Find PT.

Please help to solve this question. Thank you.