Question

22. Simplify 2(3 + 4i) + i(5 - 6i) and express it in the form a + ib
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Answer 1

2(3+4i)+i(5−6i)

=6+8i+5i−6i

2

=12+13i

which is of the form a+ib

Answer 2

Answer : 12 + i13

Step by step instructions :

2(3 + 4i) + i(5 - 6i)

= 6+8i + 5i - 6i²

= 6 + 13i - 6(-1)

= 6 + 13i + 6

= 12 + i13.

POINTS TO REMEMBER :

• i = √-1
• i² = -1 .