Expanding the Expression (5-2x)(3+x)
This article will guide you through the process of expanding the expression (5-2x)(3+x). This type of expression involves multiplying two binomials, which often requires using the FOIL method.
What is the FOIL method?
FOIL stands for First, Outer, Inner, Last. It's a mnemonic device used to remember the steps involved in multiplying two binomials.
- First: Multiply the first terms of each binomial.
- Outer: Multiply the outer terms of the binomials.
- Inner: Multiply the inner terms of the binomials.
- Last: Multiply the last terms of each binomial.
Applying FOIL to our expression
Let's apply the FOIL method to expand (5-2x)(3+x):
- First: (5)(3) = 15
- Outer: (5)(x) = 5x
- Inner: (-2x)(3) = -6x
- Last: (-2x)(x) = -2x²
Now we have: 15 + 5x - 6x - 2x²
Simplifying the expression
Finally, combine the like terms to simplify the expression:
15 - x - 2x²
Therefore, the expanded form of (5-2x)(3+x) is 15 - x - 2x².