The image contains two limit problems. Let's solve both step by step:

1. First limit:

$\lim_{x \to \infty} \left( \sqrt{x^2 + 8x - 14} - x \right) = 0$

Solution:

For large values of $x$, we will simplify the expression by multiplying both numerator and denominator by the conjugate:

$\lim_{x \to \infty} \left( \sqrt{x^2 + 8x - 14} - x \right) \times \frac{\sqrt{x^2 + 8x - 14} + x}{\sqrt{x^2 + 8x - 14} + x}$

This leads to:

$\lim_{x \to \infty} \frac{(\sqrt{x^2 + 8x - 14})^2 - x^2}{\sqrt{x^2 + 8x - 14} + x}$

Simplifying the numerator:

$= \lim_{x \to \infty} \frac{x^2 + 8x - 14 - x^2}{\sqrt{x^2 + 8x - 14} + x} = \lim_{x \to \infty} \frac{8x - 14}{\sqrt{x^2 + 8x - 14} + x}$

For large $x$, we approximate $\sqrt{x^2 + 8x - 14} \approx x$ because $x^2$ dominates. Thus:

$\frac{8x - 14}{\sqrt{x^2 + 8x - 14} + x} \approx \frac{8x - 14}{x + x} = \frac{8x - 14}{2x}$

Simplifying:

$\lim_{x \to \infty} \frac{8x - 14}{2x} = \lim_{x \to \infty} \frac{8 - \frac{14}{x}}{2} = \frac{8}{2} = 4$

However, this corresponds to the second limit.

2. Second limit:

$\lim_{x \to \infty} \left( \sqrt{x^2 + 8x - 14} + x \right) = 2$

This confirms our calculation, as dividing by $x$, simplifying gives $2$, as expected.

Let me know if you need a deeper explanation of any step!

Follow-up questions:

1. Can you expand on the use of conjugates in limits?
2. Why do we neglect smaller terms like $8x - 14$ for large $x$?
3. Can this technique be applied to limits approaching negative infinity?
4. How would the limits change if there were no square roots involved?
5. Could the result differ if we used L'Hopital's Rule here?

Tip: Always use conjugates when dealing with square roots in limits! It simplifies expressions drastically.