document.write( "Question 809218: Find the first three x-intercepts of the graph of the given function on the positive x-axis.\r
\n" ); document.write( "\n" ); document.write( "f(x) = 9 - 18 cos(x+π/3)\r
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Algebra.Com's Answer #487496 by lwsshak3(11628)\"\" \"About 
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Find the first three x-intercepts of the graph of the given function on the positive x-axis.
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\n" ); document.write( "f(x) = 9 − 18 cos(x+π/3)
\n" ); document.write( "set y=0
\n" ); document.write( "18cos(x+π/3)=9
\n" ); document.write( "cos(x+π/3)=9/18=-1/9
\n" ); document.write( "inverse cos(1/9)≈1.459455
\n" ); document.write( "..
\n" ); document.write( "1st intercept
\n" ); document.write( "x+π/3=1.459455
\n" ); document.write( "x=1.459455-π/3
\n" ); document.write( "x≈0.412258
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\n" ); document.write( "2nd intercept
\n" ); document.write( "1.459455+2π=7.742640
\n" ); document.write( "x=7.742640-π/3
\n" ); document.write( "x=6.695442
\n" ); document.write( "..
\n" ); document.write( "3rd intercept
\n" ); document.write( "1.459455+4π=14.125826
\n" ); document.write( "x=14.125826-π/3
\n" ); document.write( "x=12.978628\r
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