you can use factor of both the numerator and denominator, not a multiple, a factor
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You can't simplify a number into a bigger number, stupid
To simplify you divide the number that will go into each number evenly.
You can simplify fractions, sometimes, but you can never simplify whole numbers.
no because 43 is a prime number and you can not simplify or reduce that number because it is prime so your answer is no.
That looks simple enough for me; but if you want to factor it, you can use the formula for the difference of two squares.