anonymous
  • anonymous
Find the unknown: (-5y-2)^2+11=18
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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bahrom7893
  • bahrom7893
take -1 out from (-5y - 2)^2:
bahrom7893
  • bahrom7893
(-1[5y+2])^2 = [5y+2]^2
bahrom7893
  • bahrom7893
so now: [5y+2]^2 = 18 - 11 (move 11 to the right)

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bahrom7893
  • bahrom7893
(5y+2)^2 = 7 25y + 20y + 4 = 7
bahrom7893
  • bahrom7893
move 7 to the left: 25y + 20y +4 -7 = 0 25y + 20y - 3 = 0
bahrom7893
  • bahrom7893
Now find discriminant: D = b^2 - 4ac, where b = 20, a = 25 and c = -3
anonymous
  • anonymous
what did you do with the -1 after you factored it out?
bahrom7893
  • bahrom7893
Oh it was inside a square right, so: (-1[5y+2])^2 = (-1)^2 [5y+2]^2 = 1 * [5y+2]^2 = [5y+2]^2
bahrom7893
  • bahrom7893
Oh it was inside a square right, so: (-1[5y+2])^2 = (-1)^2 [5y+2]^2 = 1 * [5y+2]^2 = [5y+2]^2
bahrom7893
  • bahrom7893
sorry for late response, i just keep crashing..
anonymous
  • anonymous
no problem
bahrom7893
  • bahrom7893
25y + 20y - 3 = 0 D = b^2 - 4ac, where b = 20, a = 25 and c = -3 D = 400 + 300 = 700
anonymous
  • anonymous
i got it! thanks! :)
bahrom7893
  • bahrom7893
okay np.. can you please click on become a fan, thanks!
anonymous
  • anonymous
sure!

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