book Maths Puzzle Numerical Ability

to simplify a fraction with the square root of a negative number in the denominator can we multiply the fraction by the square root of the neg number over the square root of the sa

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book Other Question
how do your simplify an expression like this one 4+6(8)?? The length of a rectangle is 5 meters greater than the width. The Perimeter is 150 meters. Find the width and length.