question\nsimplify the expression to a + bi form:\n(11 + 2i) + (7 + 5i)

Explanation:

Step1: Combine real - parts

Combine the real numbers 11 and 7. $11 + 7=18$

Step2: Combine imaginary - parts

Combine the imaginary numbers $2i$ and $5i$. $2i+5i=(2 + 5)i=7i$

Step3: Write in a + bi form

Combine the results of step 1 and step 2. $18 + 7i$

Answer:

$18 + 7i$