1576630
Description
Note by Alex Burden, updated more than 1 year ago
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Created by Alex Burden
about 10 years ago
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Page 1
If x+2 is a factor then f(-2) = 0f(-2) = 2(-2)³ - 7(-2)² - 28(-2) - 12 = 2(-8) - 7(4) - 28(-2) - 12 = -16 - 28 + 56 - 12 = 0so x+2 is a factor 2x³ - 7x² - 28x - 12= (x+2)(2x² - 11x - 6) (-7x² = 4x² - 11x²)= (x+2)(2x+1)(x-6)
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