Question 617573
When completing the square on the equation cē + 11c = 12, the resulting equation is:
a.)c+11/2=+- 13/2
b.)c+11/2= +-2 squareroot 3
c.)c+124/4=+-13/2 
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Complete the square:
{{{c^2 + 11c = 12}}}
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take 1/2 'b', square it and add to both sides:
{{{c^2 + 11c + 121/4 = 12 + 121/4}}}
{{{(c + 11/2)^2 = 48/4 + 121/4}}}
{{{(c + 11/2)^2 = (48+121)/4}}}
{{{(c + 11/2)^2 = 169/4}}}
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take the square root of both sides:
c + 11/2 = +-13/2