Subtract and simplify

Question

Answer 1

We need to find a common denominator.

49x⁹ = 7(7)(x)(x)(x)(x)(x)(x)(x)(x)(x)

42x⁸ = 2(3)(7)(x)(x)(x)(x)(x)(x)(x)(x)

We need to use each factor only once.

What does 49x⁹ not have? 2(3)

What does 42x⁸ not have? 7x

36/294x⁹ - 35x/294x⁹ = (36 - 35x)/294x⁹