anonymous
  • anonymous
how do i solve this polynomial inequality, (x-4)(x+2)>0?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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myininaya
  • myininaya
find where it is zero first and then make a little chart for numbers before and after each zero
anonymous
  • anonymous
x-4=0 x+2=0 ???????
myininaya
  • myininaya
k so x=4 and x=-2 -2 comes before 4 so choose any number before -2 to see what happens to the factors btw -inf..-2 choose any number in btw -2 and 4 to see what happens to the factors between -2..4 choose any number after 4 to see what happens to the factors after 4..inf

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anonymous
  • anonymous
simple enough. thanks
anonymous
  • anonymous
x-4 > 0 x > 4 and x + 2 > 0 x < -2 therefore, the solutions are (-infinity, -2) union (4, +inifinity)
myininaya
  • myininaya
so lets the first interval i have listed choose a number before -2 like -4 so -4-4=- and -4+2=- a negative time a negative is a positive so (-inf,-2) is part of your answer now 2nd interval choose a number between -2 and 4 like 0 0-4=- 0+2=+ a negative times a positive is negative so (-2,4) is not apart of our answer now last interval choose a number btw 4..inf like 5 5-4=+ 5+2=+ a postive times a postive= positive so (4,inf) is apart of our answer so our answer is x is an element of (-inf,-2)U(4,inf) notice i didnt include the -2 and 4 because the inequality did not have a line underneath
myininaya
  • myininaya
i didn't realize someone had posted i was so busy lol
anonymous
  • anonymous
what about x^2-5x+4>0 would it then be x-1>0 and x-4>0?
myininaya
  • myininaya
i would do (x-4)(x-1)>0 x=4 and x=1 is when LHS is 0 so 1 comes before 4 so choose a number before 1 like 0 we have 0-1=-1 and 0-4=-4 (-1)(-4)>0 so (-inf,1) is part of our answer now choose a number btw 1 and 4 like 2 we have 2-1=1 and 2-4=-2 so 1(-2)=-2<0 so (1,4) is not part of answer now we choose our final test number after 4 like 100 we have 100-1=99 and 100-4=96 and (99)(96)>0 so (4,inf) is apart of our answer our answer is (-inf,1)U(4,inf)
anonymous
  • anonymous
so you choose a point before the first term. if it is true in the equation all numbers before that term will be included? then you choose a number between the two terms and if it is not true no numbers between the terms will be included? then you choose a number after the larger term, if it is true all terms larger than the greater term will be true?

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