That's what I got. to rationalize the numerator you have to multiply by the conjugate, in this case (√3 + 9) / (√3 + 9), which is what it looks like you did.
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<u>2 - z</u> + <u>5z × 3</u>
4 z
<u>2 - z</u> + <u>15z</u>
4 z
<u>z(4)(z</u>) + <u>15z(z)(4)</u><u />
4(z) 4(z)
<u> 4z²</u> + <u> 60z²</u>
4z 4z
<u>64z²</u>
4z
16z
ANSWER BELOW
#1 is the 1st choice
#2 is the 3rd choice
#3 is the 2nd choice
#4 is the 1st choice
#5 is the 1st choice
