Answer :

Sure, let's solve the problem step-by-step:

We are given the expression:
[tex]\[ (20x^2 + 15x + 13) + (-19x^2 + 17x + 5) \][/tex]

### Step 1: Grouping Like Terms

We need to group the like terms together. Like terms are terms that have the same variable raised to the same power.

- The [tex]\(x^2\)[/tex] terms: [tex]\(20x^2\)[/tex] and [tex]\(-19x^2\)[/tex]
- The [tex]\(x\)[/tex] terms: [tex]\(15x\)[/tex] and [tex]\(17x\)[/tex]
- The constant terms: [tex]\(13\)[/tex] and [tex]\(5\)[/tex]

### Step 2: Combining Like Terms

Next, we combine the like terms by adding their coefficients:

#### Combining the [tex]\(x^2\)[/tex] terms:
[tex]\[ 20x^2 + (-19x^2) = (20 - 19)x^2 = 1x^2 \][/tex]

#### Combining the [tex]\(x\)[/tex] terms:
[tex]\[ 15x + 17x = (15 + 17)x = 32x \][/tex]

#### Combining the constant terms:
[tex]\[ 13 + 5 = 18 \][/tex]

### Step 3: Writing the Final Expression

Putting it all together, we get:
[tex]\[ 1x^2 + 32x + 18 \][/tex]

So, the simplified form of [tex]\((20x^2 + 15x + 13) + (-19x^2 + 17x + 5)\)[/tex] is:
[tex]\[ x^2 + 32x + 18 \][/tex]

This is the final result.