exam Maths Puzzle Numerical Ability

how do you factor a problem such as: a-squared - b-squared + 6b - 9?

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exam Other Question

Find y-intercept and vertex y = x^2 - 3x - 4 simplify:

(x^2+2*x-35)/(x^2-7*x+12) divided by (X^2-13*x+40)/(3*x^2-12*x)