document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1138091>Question 1138091</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The area of a circle is given by the expression π(16x^2 - 40x + 25).<BR>\n" );
document.write( "a) What is the diameter of the circle?<BR>\n" );
document.write( "b) What is its circumference? </SPAN>\n" );
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document.write( "The area of a circle is given by the expression \r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A=pi%2816x%5E2+-+40x+%2B+25%29 ALIGN=MIDDLE  ALT=\"A=pi%2816x%5E2+-+40x+%2B+25%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( " \r<BR>\n" );
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document.write( "a) What is the diameter of the circle?\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A=pi%2816x%5E2+-+40x+%2B+25%29 ALIGN=MIDDLE  ALT=\"A=pi%2816x%5E2+-+40x+%2B+25%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >..........since the area of a circle is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A=pi%2Ar%5E2 ALIGN=MIDDLE  ALT=\"A=pi%2Ar%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( " <BR>\n" );
document.write( "=><IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=pi%2Ar%5E2=pi%2816x%5E2+-+40x+%2B+25%29 ALIGN=MIDDLE  ALT=\"pi%2Ar%5E2=pi%2816x%5E2+-+40x+%2B+25%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >...simplify\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5E2=16x%5E2+-+40x+%2B+25 ALIGN=MIDDLE  ALT=\"r%5E2=16x%5E2+-+40x+%2B+25\"   DISABLED_style= \"max-width:90%; height:auto;\" >...factor completely\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5E2=16x%5E2+-+20x-20x+%2B+25 ALIGN=MIDDLE  ALT=\"r%5E2=16x%5E2+-+20x-20x+%2B+25\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5E2=%2816x%5E2+-+20x%29-%2820x+-+25%29 ALIGN=MIDDLE  ALT=\"r%5E2=%2816x%5E2+-+20x%29-%2820x+-+25%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5E2=4x%284x+-+5%29-5%284x+-+5%29 ALIGN=MIDDLE  ALT=\"r%5E2=4x%284x+-+5%29-5%284x+-+5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5E2=%284x-5%29%284x+-+5%29 ALIGN=MIDDLE  ALT=\"r%5E2=%284x-5%29%284x+-+5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5E2=%284x+-+5%29%5E2 ALIGN=MIDDLE  ALT=\"r%5E2=%284x+-+5%29%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r=4x+-+5 ALIGN=MIDDLE  ALT=\"r=4x+-+5\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "then, the diameter of the circle is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d=2%284x+-+5%29 ALIGN=MIDDLE  ALT=\"d=2%284x+-+5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >=><IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d=8x+-+10 ALIGN=MIDDLE  ALT=\"d=8x+-+10\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "b) What is its circumference? \r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=C=d%2Api ALIGN=MIDDLE  ALT=\"C=d%2Api\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=C=pi%288x+-+10%29 ALIGN=MIDDLE  ALT=\"C=pi%288x+-+10%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );