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Mathematics 8 Online
OpenStudy (emmynimmy):

Algebra Help

OpenStudy (emmynimmy):

OpenStudy (emmynimmy):

@johnweldon1993

OpenStudy (mathmate):

hint: f(g(x)) means substitute g(x) in the expression for f(x), and g(f(x)) means substitute f(x) in the expression for g(x). example: f(x)=x^2+5 g(x)=x+3 f(g(x))=\((x+3)^2+5=x^2+6x+14\) g(f(x))=\((x^2+5)+3=x^2+8\) As you can see, in general, f(g(x)) \(\ne\) g(f(x))

OpenStudy (emmynimmy):

okay so how would i get the answer?

OpenStudy (mathmate):

More hints: f(x)=\(\color{red}{x^2}+5\) \(\color{blue}{g(x)}=\color{blue}{x+3}\) f(\(\color{blue}{g(x)}\))=\(\color{red}{(\color{blue}{x+3})^2}+5=x^2+6x+14\) g(f(x))=\((x^2+5)+3=x^2+8\)

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