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OpenStudy (anonymous):
Which of the following functions is quadratic? A. f(x)=7x(x+3) B. f(x)=2^2 C. f(x)= 5/x-1 D. f(x)=3(4-x) Which of the following functions is quadratic? A. f(x)=7x(x+3) B. f(x)=2^2 C. f(x)= 5/x-1 D. f(x)=3(4-x) @Mathematics
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OpenStudy (anonymous):
B
OpenStudy (anonymous):
It was a :/
OpenStudy (anonymous):
lol oh yeah
OpenStudy (anonymous):
Answer is A, because quadratic must in \[ax^{2}+bx+c \] form where a=7, b=21, c=0
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