book Maths Puzzle Numerical Ability

5(X-7)squared = 135
My question is x = 7 + 3 square root of 3 or is the anwswer 10 square root of 3? Can I add 7 with 3 square root of 3?? HELP ME PLEASE!!!
Thank you.

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book Other Question

What is the sum of 4a to the 2nd -7a-5 and -6a to the 2nd -2a + 7 I am 50 years old and I am taking a online math course online and i cannot figure out this with the fractions in it:
Solve each inequality. Give the solution set in both interval and graph forms.

7/5(10z-1)<2/3(6z+5)