Question
. Given the function f(x)=5x^2+10x-15 convert it to vertex and factored form, and list the key properties of the function, and then graph it (graph paper on next page) [16]
Solution
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(179 Votes)
Mariana
Master ยท Tutor for 5 years
Answer
### Vertex Form:
### Factored Form:
### Key Properties:- Vertex:
- Axis of Symmetry:
- X-intercepts:
and
- Y-intercept:
Explanation
## Step 1: Convert to Vertex Form### To convert the quadratic function
to vertex form, we complete the square. The vertex form of a quadratic function is given by
, where
is the vertex of the parabola.Given:
First, factor out the coefficient of
from the first two terms:
Next, complete the square inside the parentheses:
Add and subtract
inside the parentheses:
Now substitute back into the function:
Thus, the vertex form is:
## Step 2: Convert to Factored Form### To convert the quadratic function to factored form, we find the roots of the equation by solving
.Using the quadratic formula:
where
,
, and
:
So the roots are:
Thus, the factored form is:
## Step 3: List Key Properties### The key properties of the function
are as follows:- **Vertex**:
- **Axis of Symmetry**:
- **X-intercepts**:
and
- **Y-intercept**: