Exam Maths Puzzle Algebra

Please help
Find the greatest common factor (GCF)
12a^2b, 18ab^2, 24a^3b^3

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Factor the polynomial completely
ax + ay + bx - by
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Solve

2x^2 + 5x + 12 = 0

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Exam Other Question
Perform the indicated operation
1. (4 + 3m + m^2) + (m^2 + 6m + 5)
2. (x + 5) (x^2 + 2x + 10)
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