Convert the Function f(x) = (2x + 1)(x - 2) into Standard Form

Question

Find the standard representation of the following function

f(x)=(2x+1)(x2) f(x)=(2x+1)(x-2)

Video Solution

Step-by-Step Solution

To find the standard representation of the function f(x)=(2x+1)(x2) f(x) = (2x + 1)(x - 2) , we'll follow these steps to expand and simplify the expression:

  • Step 1: Distribute each term of the first binomial over each term of the second binomial using the FOIL method.
  • Step 2: Combine like terms to express the function in standard quadratic form.

Now, let's expand the expression:
1. Multiply the first terms: 2xx=2x2 2x \cdot x = 2x^2
2. Multiply the outer terms: 2x(2)=4x 2x \cdot (-2) = -4x
3. Multiply the inner terms: 1x=x 1 \cdot x = x
4. Multiply the last terms: 1(2)=2 1 \cdot (-2) = -2

Next, we combine these results:
- The 2x2 2x^2 term remains as is.
- Add the linear terms: 4x+x=3x -4x + x = -3x
- The constant term is 2-2.

Thus, the expanded and simplified form of the function is:
f(x)=2x23x2 f(x) = 2x^2 - 3x - 2

The final expression in standard form is f(x)=2x23x2 f(x) = 2x^2 - 3x - 2 .

Answer

f(x)=2x23x2 f(x)=2x^2-3x-2