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**Forkmaster** I have a test over factoring polynomials tomorrow. Most of it i have fairly well understood, but there's an extra credit section with problems we haven't discussed yet. I am not doing fantastic in math right now, so i could really use the bonus points. Can someone help explain them?

Factor Completely. (Bi) (Bi)

$\displaystyle 2x^2 - 7x - 4$

$\displaystyle 24x^2 + 47x - 2$

$\displaystyle 18c^4 - 3c^2 - 10$

$\displaystyle 16 - 9x + 15x^2$

Also, how can you determine in an answer in the format of (x + 1)(x - 2) whether it will be a +-, -+, ++, or -- answer?