anonymous
  • anonymous
Solve: sqrt{3x-5} + sqrt{2x+3} +1 =0
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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cwrw238
  • cwrw238
3x + 5 + 2x + 3 + 2sqrt(3x+5)(2x+3) = -1 2sqrt(3x+5)(2x+3 = 5x - 9 square both sides 4(3x+5(2x+3) = (5x - 9)^2 this will reduce to a quadratic equation
anonymous
  • anonymous
still confused.... sorry
cwrw238
  • cwrw238
expand both sides 24x^2 + 76x + 60 = 25x + 90x + 81 x^2 + 14x + 21 = 0

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anonymous
  • anonymous
ok, thank you for the information.. I really am only an English tutor trying to help math students
anonymous
  • anonymous
so the answer would be x^2 + 14x + 21 = 0 ..??
cwrw238
  • cwrw238
however with these type of problems because of the squaring you cannot be sure that these solutions are valid - in fact these 2 are not - if you plug them into original equation they will not fit because you cant have a real square root of a negative number eg sqrt (-1.71*3 -5) there are no solutions to this equation - the best way would have been to draw the graph i'll do that on wolfram
cwrw238
  • cwrw238
here it is ://www.wolframalpha.com/input/?i=+sqrt%7B3x5%7D+%2B+sqrt%7B2x%2B3%7D+%2B1+%3D0
anonymous
  • anonymous
ok, I appreciate that very much!
cwrw238
  • cwrw238
the graph looks like this |dw:1333575171426:dw|
cwrw238
  • cwrw238
if there were any roots the curve would intersect the x-axis yw
anonymous
  • anonymous
ok, thank you.. GOT IT!!
anonymous
  • anonymous
YOU ARE SO AWESOME!!
cwrw238
  • cwrw238
lol - ty - but it would have been wiser to draw the graph first!

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