Which of the following is equal to (14-2i)(7+12i)? (Note i=(-1)^0.5)
Choice D is correct. Applying the distributive property to multiply the binomials yields the expression 98+168i - 14i - 24(i^2)
The note in the stem of the question reminds students that i=(-1)^0.5 therefore i^2 = -1.
Substituting this value into the expression gives the student 98+168i-14i - (-24). and combining like terms results in 122+154i.