book Maths Puzzle Numerical Ability

factor 9x^2-25x-6

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book Other Question

Im not sure what they want me to do.
Find g(9) given that g(x) = 2x + 3
How could I create a slope-intercept form if I am given this information: x int = 3, y int = 2. The only equation I could find to use was y-2 = m(x-3). Is this the correct form to use?