Westonci.ca is your go-to source for answers, with a community ready to provide accurate and timely information. Get detailed and accurate answers to your questions from a dedicated community of experts on our Q&A platform. Get detailed and accurate answers to your questions from a dedicated community of experts on our Q&A platform.
Sagot :
We need range
[tex]\\ \sf\longmapsto f(x)=-0.7x^2-2.7x+4[/tex]
- See here x^2 will come greater than or equal to zero.
Least value of x^2 is 0
[tex]\\ \sf\longmapsto -0.7(0)+2.7(0)+4=4[/tex]
So
range
[tex]\\ \sf\longmapsto R_f=[4,\infty)[/tex]
Answer:
6.60
Step-by-step explanation:
Method I - Algebra
For quadratics of the form ax^2 + b + c the vertex is at
x = -b/2a
x = 2.7/(2 * -0.7)
x = 2.7 / (-1.4)
x = -1.9285714286
-----------------------------
Method II - Calculus
Take the first derivative and set to zero
2(-0.7)x - 2.7 = 0
-1.4x - 2.7 = 0
-1.4x = 2.7
x = 2.7/(-1.4)
x = -1.9285714286
-----------------------------
pluging x = -1.9285714286 into the function
f(-1.9285714286) = -0.7(-1.9285714286)^2 - 2.7(-1.9285714286) + 4
f(-1.9285714286) = 6.6035714286
Rounded
f(-1.9285714286) = 6.60
--------------------------------------
We appreciate your visit. Our platform is always here to offer accurate and reliable answers. Return anytime. We hope you found this helpful. Feel free to come back anytime for more accurate answers and updated information. We're glad you chose Westonci.ca. Revisit us for updated answers from our knowledgeable team.