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Earn +20 ptsQ: Factor 9 - x2
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How do you factor x2-9x?
x2-9x = x(x-9)
How do you factor 5x2 - 45?
To factor any term, divide by the LCF (largest common factor) of the term. For 5x2-45, the LCF is 5. 5x2-45 = 5(x2-9) It can, of course, be factored even further to become: 5(x2-9) = 45(x2/9 - 1) but when factoring, we usually don't need to go past 5(x2-9) (for example, you've figured out that x2 = 9, thus x = +/- 3.)
What is the factor of this trinomial x2-6x-27?
x2-6x-27 = (x+3)(x-9) when factored
Factor x2 - 14x plus 45?
x2 - 14x + 45 = (x - 5)(x - 9).
Factor x2 plus 13x plus 36 completely?
x2 + 13x + 36 = (x + 9)(x + 4)
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