find the interval on which the function f(x)=x²+5x²+8x+1 is a strictly increasing function
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1
Answer:
f(x)=x
2
+2x−5
f
′
(x)=2x+2
When x<−1,f
′
(x)<0
When x>−1,f
′
(x)>0
∴ For x>−1,f(x) is strictly increasing
∴(−1,∞)
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5
Answer:
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