The answer is b. There is a picture of the graphed function: y=3(1/2)^x
Complex solutions, namely roots with a √(-1) or "i" in it, never come all by their lonesome, because an EVEN root like the square root, can have two roots that will yield the same radicand.
a good example for that will be √(4), well, (2)(2) is 4, so 2 is a root, but (-2)(-2) is also 4, therefore -2 is also a root, so you'd always get a pair of valid roots from an even root, like 2 or 4 or 6 and so on.
therefore, complex solutions or roots are never by their lonesome, their sister the conjugate is always with them, so if there's a root a + bi, her sister a - bi is also coming along too.
if complex solutions come in pairs, well, clearly a cubic equation can't yield 3 only.
Credit 1 and Credit 3! Just took the test :)
ANSWER:84.823 sq.cm (approx.)
Area of shaded region,
=Area of whole circle-Area of the quadrant AOB which is cut out.
=π*6*6-(π*6*6)/4 sq.cm
=36π-9π sq.cm
=27π sq.cm
=84.823 sq cm(approx.)
