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2015-09-30T16:35:11+05:30

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To check if (x-5) is a factor of the polynomial 2x³ - 5x² - 28x + 15,
First equate x-5 to 0 and find value of x.
x -  = 0
⇒ x = 5
If x=5 is a root of the polynomial, then (x-5) is a factor.

at x=5, value of polynomial is
2×(5)³ - 5×(5)² - 28×(5) + 15,
= 2×125 - 5×25 - 28×5 + 15
= 250 - 125 - 140 + 15
= 265 - 265
= 0
So 5 is a root of the polynomial.
Thus (x-5) is a factor of the polynomial.
1 5 1
2015-09-30T16:38:56+05:30
21.00034 is the answer
12346-1236586%_1235789
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