if-2is a root of 3x2+5x+2k then find the value of k
Answers
Answered by
0
Answer:
-11
Step-by-step explanation:
-2 is the root of the equation. So x = -2.
Putting value of x in the equation.
3(-2)^2 - 5(-2) +2k = 0
3*4 + 10 + 2k = 0
12 + 10 + 2k =0
22 + 2k = 0
2k = -22
k = -22/2
k = -11
Thus the value of k is -11.
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Answered by
133
Answer:
- Value of k is -1.
Step-by-step explanation:
Given:
- -2 is root of 3x² + 5x + 2k
To Find:
- Value of k.
Now, if -2 is root of given equation, then substitute the given value in place of x to find value of k.
⇒ 3x² + 5x + 2k = 0
⇒ 3(-2)² + 5(-2) + 2k = 0
⇒ 3(4) - 10 + 2k = 0
⇒ 12 - 10 + 2k = 0
⇒ 2 + 2k = 0
⇒ 2k = -2
⇒ k = -2/2
⇒ k = -1
Hence, Value of k is -1.
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