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solve the quadratic inequality , and graph the solution on the number line. (x+1)(x-9)less than 0.
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\n" ); document.write( "Draw the number line and mark x=-1 and x=9 as they are the zero
\n" ); document.write( "points for your inequality.
\n" ); document.write( "Now, examine the inequality with values from each of the three segments
\n" ); document.write( "created on the number line by these points.
\n" ); document.write( "In interval I, which is (-infinity,-1), choose x=-10.
\n" ); document.write( "You get (-10+1)(-10-9) which is >0, so there are no
\n" ); document.write( "solutions in interval I.
\n" ); document.write( "In interval II, which is (-1,9) choose x=0.
\n" ); document.write( "You get (0+1)(0-9) which is <0, so interval II is
\n" ); document.write( "part of the solution of the inequality.
\n" ); document.write( "In interval III, which (9,+infinity), choose x=10.
\n" ); document.write( "You get (10+1)(10-9), which is >0 so there are no
\n" ); document.write( "solutions in interval III.
\n" ); document.write( "SOLUTION:
\n" ); document.write( " -1
\n" ); document.write( "Stan H.