Find the simplest form of the expression — task. Mathematics CBSE, Class 9 New.

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Simplify the following rational expression assuming that the expressions in the denominators are not equal to zero:

\frac{(x^{2} + 3 x -18) (x^{2} -13 x + 42)}{(x^{2} -10 x + 21) (x^{2} - 36)}

Ans:

\frac{((x + i) (x - i)) \times ((x - i) (x -7))}{((x - i) (x -7)) \times ((x - i) (x + i))} = i

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36. Find the simplest form of the expression