exam Maths Puzzle Numerical Ability

r^3+7r^2-18r

factor the above

x^2y-9xy^2-36y^3

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exam Other Question

question is reduce the rationals expression to the lowest terms

3x^2 - 9x+6 over 10-5x How do I solve using two equations with two variables?

The units digit of a two-digit number is 4 times the tens digit. If the digits are reversed, the new number is 54 more than the original number. Find the number.