exam Maths Puzzle Numerical Ability

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y > 3

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O.k the problems are:(-7)to the power of 5 times (-7) times the power of -2. It said on the worksheet to wite the product without exponents. How can you solve it? 3 over a^2-9 + 2 over a+3
all over
4 over a^2 -9 + 1 over a+3

the answer is 2a-3 over a+1

show how you would get that