exam Maths Puzzle Numerical Ability

1.) 2x^2 - 5x + 7 � X - 2

2.) a^3 + b^3 + c^3 - abc � a + b + c

3.) 9m^2 + 25 � 3m + 5

4.) 6x^2 - 11 x + 21 � x + 3

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exam Other Question

Five pencils and three erasers cost 65 cents. Three pencils and two erasers cost 40 cents. Find the cost of one pencil and one eraser. I need some help on this equation. I need to use the gauss-jordan method solving by matrices. thanks
4x - 2y = 3
-2x + 3y = 1