exam Maths Puzzle Numerical Ability

Write an equation for the parabola whose vertex is at (-8,4) and passes through (-6,2).

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exam Other Question

Multiplication of matrices are only commutative for some cases of matrices. What are these cases? Tutor: I am having difficulty with this problem: How do I subtract this:

4x+1/25x^2+15x+2 minus 3x-2/30x^2+11x+1

Thank you!