exam Maths Puzzle Numerical Ability

Please help me! It asks to express irrational solutions in simplest radical form.
The problem is a^2-64=0
Please and Thank You=)

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exam Other Question
difference of two negative integers is 8? find the integers? i am trying to figure out y-intercept.
can you help me find the y-intercept of this problem.?
4x=y+2