exam Maths Puzzle Numerical Ability

Solve the following equations for x by the square root method
64x2=25

That equation is 64x squared = 25. Please help. I am totally confused!!!

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exam Other Question

how do you solve:

r + s + 2t - u = -3
2r + 3s + 3t + u = 2
4r + 2s - t + u = 5
s + 2t + 2u =7 determine the equation of the parabola with x-intercepts -4 and 3, and that passes through (2,7)