Provide an appropriate response.A student is trying to solve the equation (x + 5)(x - 9) = 4. The student has set x + 5 = 4 and x - 9 = 4 and found that two solutions x = -1, x = 13. The student checks his or her results by plugging in his or her solutions into the original equation and finds that they do not work. How would you advise him or her?
What will be an ideal response?
The equation needs to be set to zero in order to use the zero-factor theorem.
Mathematics
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Find the difference.-2 - 14
A. -16 B. -12 C. 12 D. 16
Mathematics
The concentration of a drug in an organ at any time 
(in seconds) is given by
?
?
where 
is measured in milligrams/cubic centimeter (mg/cm3). What is the concentration to four decimal places of the drug in the organ after 5 sec?
?
A. 1.1419 mg/cm3
B. 1.5153 mg/cm3
C. 1.0608 mg/cm3
D. 15.1987 mg/cm3
Mathematics
Graph the function by starting with the graph of the basic function and then using the techniques of shifting, compressing, stretching, and/or reflecting.f(x) = 
x3
A. 
B. 
C. 
D. 
Mathematics
Graph the given parabola.y = -x2 - 4x
A. 
B. 
C. 
D. 
Mathematics