Answer :

Sure, let's simplify the given expression step by step.

We begin with the expression:
[tex]\[ \sqrt{125} + \sqrt{36 + 64} \][/tex]

### Step 1: Simplify Inside the Square Root

First, we simplify the expression inside the second square root:
[tex]\[ 36 + 64 = 100 \][/tex]
Now the expression becomes:
[tex]\[ \sqrt{125} + \sqrt{100} \][/tex]

### Step 2: Simplify the Square Roots

Next, we find the values of each square root.

1. For \(\sqrt{125}\):

125 can be factored into its prime factors:
[tex]\[ 125 = 5 \times 25 = 5 \times (5 \times 5) = 5^3 \][/tex]

Taking the square root of 125:
[tex]\[ \sqrt{125} = \sqrt{5^3} = \sqrt{5^2 \times 5} = 5\sqrt{5} \][/tex]

2. For \(\sqrt{100}\):

100 can also be factored:
[tex]\[ 100 = 10 \times 10 = 10^2 \][/tex]

Taking the square root of 100:
[tex]\[ \sqrt{100} = 10 \][/tex]

### Step 3: Add the Simplified Square Roots

Now that we have simplified both square roots, we add them together:
[tex]\[ 5\sqrt{5} + 10 \][/tex]

So, the simplified form of the expression \(\sqrt{125} + \sqrt{100}\) is:
[tex]\[ 10 + 5\sqrt{5} \][/tex]

### Conclusion

The simplified form of the expression \(\sqrt{125} + \sqrt{36 + 64}\) is:
[tex]\[ 10 + 5\sqrt{5} \][/tex]