document.write( "Question 63216: Let f(x)=7x an g(x)= 2x^2-9. find the following:\r
\n" ); document.write( "\n" ); document.write( "(fog)(x) (gof)(x) (fog)(2) and (gof)(-1)
\n" ); document.write( "not sure what i am doing,,,thanks for your help
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Algebra.Com's Answer #44061 by jai_kos(139)\"\" \"About 
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Let f(x)=7x an g(x)= 2x^2-9. find the following: \r
\n" ); document.write( "\n" ); document.write( "(fog)(x) (gof)(x) (fog)(2) and (gof)(-1)\r
\n" ); document.write( "\n" ); document.write( "not sure what i am doing,,,thanks for your help\r
\n" ); document.write( "\n" ); document.write( "Solution:\r
\n" ); document.write( "\n" ); document.write( "Given fog(x) = f(g(x)) = f(2x^2 -9) = 7(2x^2 -9) = 14x^2 -56\r
\n" ); document.write( "\n" ); document.write( "g0f(x) = g(f(x) = g(7x) = 2(7x)^2 -9 = 2(49x^2) - 9 = 98x^2-9\r
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\n" ); document.write( "\n" ); document.write( "Fog(2) = 14(2)^2 - 56 = 0 \r
\n" ); document.write( "\n" ); document.write( "gof(-1) = 98(-1)^2 - 9 = 98 - 9 = 89
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