3. If the roots of x^2+ kx + k = 0 are real and equal, what is the value of k?
(A) 0
(B) 4
(C) 0 or 4
(D) 2.
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2
Answer:
Given x
2
+kx+k
roots are real & equal
∴b
2
−4ac=0
=(k)
2
−4(1)(k)=0
=k
2
−4k=0
=k(k−4)=0
∴ k = 0 or k = 4
Step-by-step explanation:
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