anonymous
  • anonymous
Solve equation: (d+2)(d-5)=-6
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
Can anyone help!!!
anonymous
  • anonymous
i think its d^2 - 5d + 2d - 10 = -6 d^2-3d-10=-6 d^2-3d=4
anonymous
  • anonymous
and d = -2 or d= 5

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sandra
  • sandra
well, these are easier to solve if you expand them and then factor them back out once you have something that equals zero
sandra
  • sandra
so for example, if you use foil, you get:
sandra
  • sandra
d^2 -5d + 2d -10 = -6
sandra
  • sandra
d^2 -3d -4 = 0
sandra
  • sandra
now that you have the right side equal to zero, you can factor back out
sandra
  • sandra
and get (d+1)(d-4) = 0
sandra
  • sandra
so once you have a factored left hand side that equals zero, you know that the solutions are the two values that make either of the left hand components zero
sandra
  • sandra
since zero times anything is zero
sandra
  • sandra
so one of the solutions is d=-1
sandra
  • sandra
can you get the other now?

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