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12y
It is an algebraic expression with its plus or minus signs missing
-9x^2 - 15x
A quadratic. For example, x^2 + 3x - 7xy - 12y - 25 = 0
gcf(35x², 7xy², 21x²y²) = 7x 35x² = 5 times 7 times x² 7xy² = 7 times x times y² 21x²y² = 3 times 7 times x² times y² hcf = 7 times x = 7x (I've written the multiplication as times instead of using the × symbol to avoid confusion with the unknown x.)