The expression in the image is:

$\sqrt{4} + \sqrt{25} - \sqrt{9} - \sqrt{2^2} \times \sqrt{7^2} + 4$

Let's break it down step by step:

1. $\sqrt{4} = 2$
2. $\sqrt{25} = 5$
3. $\sqrt{9} = 3$
4. $\sqrt{2^2} = 2$
5. $\sqrt{7^2} = 7$

Now, substitute these values back into the expression:

$2 + 5 - 3 - (2 \times 7) + 4$

Simplify:

$2 + 5 - 3 - 14 + 4$

Now, perform the operations from left to right:

$(2 + 5) = 7$ $7 - 3 = 4$ $4 - 14 = -10$ $-10 + 4 = -6$

The final result is:

$\boxed{-6}$

Would you like a further breakdown or explanation of any step?

Here are five related questions to expand your understanding:

1. What is the general rule for simplifying square roots of perfect squares?
2. How does the order of operations affect the calculation in this expression?
3. Why is $\sqrt{2^2}$ simplified to 2, and how does this rule apply to other squares?
4. How does multiplication inside square roots differ from operations outside them?
5. Can square roots of non-perfect squares be simplified similarly?

Tip: Always resolve powers and square roots before applying addition, subtraction, or multiplication.