document.write( "Question 137548: Solve.
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document.write( "(x-4)(x+2)>or=0. Write answer in scientific notation.
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Algebra.Com's Answer #100626 by stanbon(75887) ![]() You can put this solution on YOUR website! Solve. \n" ); document.write( "(x-4)(x+2)>or=0 \n" ); document.write( "-------------------- \n" ); document.write( "1st: Solve the EQUALITY: \n" ); document.write( "x=4 or x=-2 \n" ); document.write( "-------------------- \n" ); document.write( "2nd: Solve the INEQUALITY: \n" ); document.write( "Draw a number line; mark x=-2 and x=4 on the line. \n" ); document.write( "Test a value from each of the three intervals on the line in (x-4)(x+2)>0 \n" ); document.write( "If x=-100 you get -*->0 which is true, so solutions in (-inf,-2) \n" ); document.write( "If x=3 you get -*+ >0 which is false, so no solutions in (-2,4) \n" ); document.write( "If x = 100 you get +*+>0 which is true, so solutions in (4,+inf) \n" ); document.write( "---------------------- \n" ); document.write( "Final answer for equality and inequality: (-inf,-2] or {4,+inf) \n" ); document.write( "======================= \n" ); document.write( "Cheers, \n" ); document.write( "Stan H. \n" ); document.write( " |