we know that
The formula to solve a quadratic equation of the form
is equal to
Step 1
Solve the quadratic equation by the formula
in this problem we have
so
substitute in the formula
Step 2
<u>Statements about Marcus work</u>
<u>case A)</u> Marcus should have substituted
for b, not 
The statement is True
The value of b is 
See the procedure in Step 
<u>case B)</u> The denominator should be 1, not 2
The statement is False
The denominator is 
See the procedure in Step 
<u>case C)</u> Marcus should have subtracted
in the square root
The statement is True
See the procedure in Step 
<u>case D) </u>This equation, when solved correctly, only has 1 real number solution
The statement is True
See the procedure in Step 
The solution is 
<u>case E)</u> This equation has
real number solutions
The statement is False
The equation has only one real number solution
See the procedure in Step 