exam Maths Puzzle Numerical Ability

Perform the indicated operations

(3x-7)-(x+5)

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exam Other Question

Completely factor the following: x^4 - 13x^2 + 36

This what I have done, please let me know if it is right, or not, what I did wrong thanks, lackinmath

(x^2-9)(x^2-4)
(x-3)(x+3)(x-2)(x+2) how do you write ten minus the quotient of one number and another number as an algebraic equation?