SOLUTION: what number is used to complete the square for the equation r^2-3r=4 a.)-2.25 b.)1.5 c.)2.5 d.)2.25

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Question 324959: what number is used to complete the square for the equation r^2-3r=4

a.)-2.25
b.)1.5
c.)2.5
d.)2.25
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
To complete the square, take half of the r-coefficient and square it.
%28-3%2F2%29%5E2=9%2F4=2.25
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D) is the correct answer.