Which of the following quadratic equations can be solved by grouping?(1 point)

To determine which quadratic equations can be solved by grouping, we look for factors of the quadratic that can be grouped together.

1. **\(x^2 + 8x - 22 = 0\)**: This does not factor nicely for grouping since it does not produce simple integer factors.

2. **\(x^2 + 10x + 21 = 0\)**: This factors nicely as \((x + 3)(x + 7) = 0\). However, it can also be solved by observation without needing to group.

3. **\(x^2 - 4x - 8 = 0\)**: This does not produce factors easily and doesn’t lend itself well to grouping.

4. **\(x^2 - 12x + 18 = 0\)**: This also does not factor nicely for grouping.

In conclusion, none of these equations can specifically be classified as easily solved by grouping. However, **\(x^2 + 10x + 21 = 0\)** can be solved through factoring, but it's not the classic case of "solving by grouping."

If you’re looking for the best candidate from the list for grouping, I would say **none fit perfectly**, but the simplest form of factoring appears in **\(x^2 + 10x + 21 = 0\)**.