Question

find the interval on which the function f(x)=x²+5x²+8x+1 is a strictly increasing function​

Answer 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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Answer 2

Answer:

it is your answer

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