exam Maths Puzzle Numerical Ability

please help me with these problems:

what is the square roots of 128 and 80?

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exam Other Question

3ln5x=10 Simplify: (3x^2 + 6x - 8) + (-5x^2 - 8x + 4)
A) -2x^2 - 14x -12
B) -2x^2 - 2x - 4
C) 3x^2 + 2x + 12
D) 8x^2 + 14x + 12