Question

Simplify the expression (10 + 3i)(10 - 3i)

91
109
100-30i
100+30i

Answer 1

Answer:

(10 + 3i)(10 - 3i)=109

Step-by-step explanation:

$(10+3i)(10-3i)=(10^{2} -10*3i)+(3*10i-3*3i^2)\\ =100-30i+30i-9i^2\\=100-9*(-1)\\=100+9=109$

Answer 2

Answer:

B) 109

Step-by-step explanation:

I took the test and got a 100%