exam Maths Puzzle Numerical Ability

Factor the polynomial 3x^2-14x-5

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exam Other Question

three years ago mary was three times as old as her sister. now mary is twice as old as her sister. how old is mary now.
please show work A rectangle has sides of 5x-12 and 5x+12. What is the area of the rectangle? In side the rectangle two squares with sides of x and x are to be removed. What is the remaining area of the rectangle?