exam Maths Puzzle Numerical Ability

8. Factoring is very hard for me. How do I complete this one?

15x^2 + 7x - 2

thank you for your help.

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exam Other Question

Factor 3 x 2 + 3 x y + 8 x + 8 y by grouping. A ball is thrown upward from the to of a 98-meter tower with an initial speed of 39.2 m/s. How much later will it hit the ground? Hint: If h is the height of the ball above the top of the tower, then h=98 when the ball hits the ground