exam Maths Puzzle Numerical Ability

factor 126 into prime numbers

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exam Other Question

Having the hardest time trying to figure these out.

1) reduce to lowest term: 3x-6/8-4x

2)5x/x^2-1 , 4/x^2-2x+1
a. find the LCD
b. Convert each expression into an equivile mulitiply (x+6)(x^3-3x^2-5x+1)