book Maths Puzzle Numerical Ability

3 sqrt(x)^2 = 4

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reduce to lowest terms 2b2-2b-12 over b2-9 thanks I NEED TO SET UP AN EQUATION FOR THIS WORD PROBLEM:
THE SUM OF TWO NUMBERS IS 18. THREE TIMES THE GREATER NUMBER EXCEEDS FOUR TIMES THE SMALLER NUMBER BY 5. FIND THE NUMBERS.