Ms. Gallagher pays $9 for a pack of 36 cupcakes for her son's birthday.
1 answer:
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We are asked to write the following fraction of complex numbers in standard form: 
.
Whenever we are dividing by a complex number by another complex number a+bi, to write the result in standard form, we multiply the expressions in the numerator and denominator by the conjugate of a+bi, that is a-bi:
in the numerator we distribute (3-i) to 1 and -5i, in the denominator we use the difference of squares formula
, and 
:
Answer: D
Whenever we are dividing by a complex number by another complex number a+bi, to write the result in standard form, we multiply the expressions in the numerator and denominator by the conjugate of a+bi, that is a-bi:
in the numerator we distribute (3-i) to 1 and -5i, in the denominator we use the difference of squares formula
Answer: D