Maths-
General
Easy

Question

Identify the vertex, axis of symmetry and direction of the graph of each function, Compare the width of the graph to the width of the graph of f(x)= x2
H(x)= -3(x+2)2 – 5

hintHint:

The vertex form of a quadratic function is
f(x) = a(x – h)2 + k
Where a, h, and k are constants. Here, h represents horizontal translation, a represents vertical translation and (h,k) is the vertex of the parabola. Also, a represents the Vertical stretch/shrink of the parabola and if a is negative, then the graph is reflected over the x-axis.
The axis of symmetry of a parabola is a vertical line that divides the parabola into two congruent halves. The axis of symmetry always passes through the vertex of the parabola. The x-coordinate of the vertex is the equation of the axis of symmetry of the parabola.
 

The correct answer is: f(x) = x2


    Parent function is f(x) = x2
    Given, H(x)= -3(x+2)2 – 5
    Here, h = -2, k = -5 and a = -3
    So, the vertex of the parabola is (-2,-5) and the axis of the symmetry is x = -2. As a < 0 so the graph is open downwards.
    As a > 1, the width of the function H(x)= -3(x+2)2 – 5 is less then the width of the parent function f(x) = x2.
    Final Answer:
    Hence, the vertex of the parabola is (-2,-5), the axis of the symmetry is x = -2, the graph is open downwards and the width of the function H(x)= -3(x+2)2–5 is less then the width of the parent function f(x) = x2.

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