Question

Select all expressions that are equivalent to 26i.
A.13i+ 3i + 5i+ Si
B.(4+ 6:)(3 + 21)
C.(7+ 12i) - (7-14i)
D. (13i)(21)
E. 13 +i+13

Answer 1

Answer:

A, B and C (but see below).

Step-by-step explanation:

C.

(7 + 12i - (7 - 14i)

= 7 - 7 + 12i + 14i

= 26i.

Looks like you have typos in part B so I've rewritten it:

B.

(4 + 6i)(3 + 21i

=12 + 8i + 18i + 12i^2

= 12 + 8i + 18i - 12

= 26i

Also I think A is:

.13i+ 3i + 5i+ 5i

= 16i + 10i

= 26i.