Practice problem
Factor the numerator of the fraction 7x2+21x−280x−5\frac{7x^2+21x-280}{x-5}x−57x2+21x−280 as written, without simplifying.
7(x−5)(x+8)7(x-5)(x+8)7(x−5)(x+8)
7(x2+3x−40)7(x^2+3x-40)7(x2+3x−40)
7(x+8)7(x+8)7(x+8)
x2+3x+40x^2+3x+40x2+3x+40
Type a concept, like “slope” or “photosynthesis”.