anonymous
  • anonymous
how do you factor 5x2 − 2x − 7
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
plz help!!!!
rosedewittbukater
  • rosedewittbukater
\[5x^2 -2x-7\] First, know that the first number -7 and the last number 5 multiply to equal -35. Then find two factors of -35 that add up to equal -2. In this case, -7 and 5 add up easily. -7 + 5 = -2 Put 5x and -7x in place of the 2x. 5x^2 + 5x - 7x -7 Group the first 2 terms and the second terms separately like this (5x^2 + 5x) + (-7x - 7) Then take out any common factors from both groups. Those are 5x and -7 5x(x + 1) - 7(x+1) Then group the common factors 5x and -7 you took out into one group. Also, since there are two (x+1)'s, make the x+1 one group like this. (5x-7) (x+1) You can check your work by multiplying everything back the way it was and seeing if it is the same as it was in the beginning. 5x^2 + 5x - 7x - 7 5x^2 - 2x - 7 I hope I explained it well enough. Some people do it a different way but this is how I do it.
anonymous
  • anonymous
thank you!

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rosedewittbukater
  • rosedewittbukater
Your welcome :)

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