exam Maths Puzzle Numerical Ability

Factor out the greatest common factor from the polynomial

21x^3 - 6x^2 + 15x

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exam Other Question

3x^2y^7sqrt of x can someone please help me with this question?

If x^/a^2 + y^2/b^2=1a>b is an ellipse then its directrices are__________?

thanks for any help. this is from a question in clas