Question

ab+ 2i = 7 +bi. If a and b are real numbers and if i^2 = -1, then what is the value of a?
A) 3.5
B) 4
C) 4.5
D) 5
E) 5-i

Answer 1

3.5

Answer 2

A 3.5

Answer 3

how did u get that answer :O can u explain it please

Answer 4

yes quite easy
real part equal real and imaginary equal imaginay , u ger b=2 and ab=7

Answer 5

and finally a=3.5

Answer 6

got it or not?

Answer 7

3.5 . u get it by equating the real and imaginary parts

Answer 8

yes

Answer 9

its clear now or not?