Question
Download Solution PDFIf x - 2 is a factor of the polynomial x2 + ax + 2b and a + b = -2, then the values of a and b will be:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation -
If x - 2 is a factor of the polynomial x2 + ax + 2b, it means that when x = 2 is substituted into the polynomial, the result should be zero.
Let's substitute x = 2 into the polynomial x2 + ax + 2b and set it to zero:
Given polynomial: x2 + ax + 2b
Substituting x = 2:
\((2)^2 + a(2) + 2b = 0\\ 4 + 2a + 2b = 0\\ 2a + 2b = -4\\ a + b = -2 \)
We also have the given condition that a + b = -2.
Hence both the equations are same so we want to find the value of a and b from the given options.
(1) a = -1, b = -3
a + b = -1 +(-3) = -1 -3 = -4
So false.
(2) a = 1, b = 3
a + b = 1 + 3 = 1 + 3 = 4
So false.
(3) a = -3, b = 1
a + b = 1 + (- 3) = 1 - 3 = -2
So true.
(4) a = 5, b = -3
a + b = 5 + (- 3) = 5 - 3 = 2
So false.
Hence the correct answer is a = -3, b = 1.
Last updated on Jan 29, 2025
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