exam Maths Puzzle Numerical Ability

If possible, factor: f(x)= x squared - 6x - 91

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Jasmine says that there are 362,880 distinguishable permutations of the letters in the word TEXTBOOKS. Do you agree? Justify your answer. How do I solve using two equations and two variables?

The tens digit of a two-digit number is twice the units digit. If the digits are reversed, the new number is 36 less than the original number. Find the number.