Q. Simplify.−9i−4iWrite your simplified answer in the form a+bi.
Separate numbers and imaginary unit: Separate the numbers and the imaginary unit (i). The expression (−4i)/(−9i) can be written as (−4)/(−9)×i/i.
Simplify negative fraction: Simplify the fraction(−4)/(−9).Since both the numerator and the denominator are negative, they will cancel each other out, leaving us with a positive fraction.(−4)/(−9) simplifies to 4/9.
Simplify imaginary unit: Simplify the imaginary unit fraction i/i.The imaginary unit i divided by itself is just 1, because any non-zero number divided by itself equals 1.i/i simplifies to 1.
Multiply fractions: Multiply the simplified real fraction by the simplified imaginary unit fraction. 94×1 equals 94.
Write final answer: Write the final answer in the form a+bi. Since there is no real part and the imaginary part is 94, the final answer is 0+94i.