book Maths Puzzle Numerical Ability

Solve using the square root property:
5x^2=100
5(2*51/2)

Is this correct?

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book Other Question

Simplify.
a^5 * a^ 3 = a^8
Cheers,
Stan H. Isolate for "t": m=16t^2+vt+7
thanks, i cant seem to figure it out... are you supposed to divide it out?