Expand (x + 1)(x − 1)
Worked out line by line the way a teacher would write it.
Answer
| Expanded form | x² − 1 |
Step-by-step solution
3 steps-
1 Given\left(x + 1\right) \left(x - 1\right)
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2 Multiply the binomials (FOIL: First, Outer, Inner, Last)
To multiply two binomials, multiply every term of one by every term of the other: the First terms, the Outer terms, the Inner terms and the Last terms, four products in all.
\left(x \cdot x + x \cdot (-1) + 1 \cdot x + 1 \cdot (-1)\right) -
3 Multiply out and combine like termsx^{2} - 1
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