Exam Maths Puzzle Algebra

Please help solve this. In front of the 7z^16, please place a radical symbol. I did not not know how to create here.

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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
Q. FIND THE LCD FOR THE RATIONAL EXPRESSION AND CONVERT INTO AN EQUIVALENT RATIONAL EXPRESSION WITH THE LCD AS THE DENOMINATOR
x/x^2-9, 5x/x^2-6x+9


57. PERFORM THE INDICAT