exam Maths Puzzle Numerical Ability

Factor by grouping:
18a^3 - 24a^2b + 15ab^2 - 20b^3

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exam Other Question

Divide Following rational expressions :

1- 25xy^2 / 7z divided by 5x^2y^2 / 14z^2 numerator / denominator

2- x^2-12x+32 / x^2-6x-16 divided by x^2-x-12 / x^2-5 Which of the following expressions represents the product of 3 less than twice x and 2 more than the quanity 3 times x?

A. -6xsquared + 25x + 6
B. 6xsquared + 5x + 6
C. 6xsquared - 5x + 6
D. 6xsquared - 5x -6
E. 6xsquared - 13x - 6