exam Maths Puzzle Numerical Ability

Can you please help me with this i do not understand it.

Solve using the square root property

5x^2 = 100

thank you
julie

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exam Other Question

How can i find the x-intercepts of a graph Please help me solve this word problem:

A ladder is resting against a wall. The top of the ladder touches the wall at a height of 18 feet. Find the length of the ladder if the length is 6 feet more than its distance from the wall.