Question

x=3, 3x+2÷5x-7= please help i have been stuck on this

Answer 1

Step-by-step explanation:

The question is:-

• x=3, 3x+2÷5x-7=

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f(x)=x3−3x2+5x+7

f′(x)=3x2−6x+5

The discriminant of the above quadratic equations is

Δ=36−4(3)(5)=36−60<0

∴f′(x)>0 ∀x∈R+, 

Also f′(x)>0 ∀x∈R−

Required answer:- ✅

• ∴ f is increasing in R.

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