Maths-
General
Easy
Question
Compare each function to f, shown in the table. Which function has lesser minimum value? Explain
g(x) = 2x2 + 8x + 3
The correct answer is: -5
Solution:- We have given two functions f(x) and g(x).
g(x) = 2x2 + 8x + 3
For f(x) , minimum value of the function will be the y-coordinate of the given point which has minimum values
(1,0) , (2,-3) , (3,-4) , (4,-3) (5,0)
In the given points minimum value of is (3,-4)
So, the ,minimum value of f(x) is -4.
In g(x)= 2x2 + 8x + 3, a= 2, b= 8, and c=3. So, the equation for the axis of symmetry is given by
x = −(8)/2(2)
x = -8/4
x = -2
The equation of the axis of symmetry for g(x)= 2x2 + 8x + 3 is x = -2.
The x coordinate of the vertex is the same:
h =-2
The y coordinate of the vertex is :
k = f(h)
k = 2h2 + 8h + 3
k = 2(-2)2 + 8(-2) + 3
k = 8 - 16 + 3
k = -5
Therefore, the vertex is (-2 , -5)
The minimum value of g(x) will be the y-coordinate of vertex = -5
The equation of the axis of symmetry for g(x)= 2x2 + 8x + 3 is x = -2.
The x coordinate of the vertex is the same:
The y coordinate of the vertex is :
Therefore, the vertex is (-2 , -5)
The minimum value of g(x) will be the y-coordinate of vertex = -5
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