book Maths Puzzle Numerical Ability

Please extract the square roots from the following problems, thank you.
1. 3(x+4)^2-54=0
2. 81x^2=16
Complete the Square:
1. -9x=5x^2-1

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book Other Question

In a town election, the winning candidate had 220 more votes
than the loser. If 810 votes were cast in all, how many votes did each candidate receive? Graph the following linear equations and advise points:
3x-2y=12
and
y=2x+5

thanks!