Question

The a+bi form is for (2+3i)(2-3i)* O 13+3i O 13 O i 13+i 13-1​

Answer 1

Answer:

The answer is 13

Step-by-step explanation:

$(2+3i)(2-3i)$

$=2^2-(3i)^2$, since $(a-b)(a+b)=a^2-b^2$

$=4-9i^2\\=4-9(-1)\\=4+9=13$

(  since $i^2=-1$ )