anonymous
  • anonymous
Use the quadratic formula to solve x2 + 8x = –2.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Solve for x over the real numbers: \[x^2+8 x = -2\] Take one half of the coefficient of x and square it, then add it to both sides. Add 16 to both sides: \[x^2+8 x+16 = 14\] Factor the left hand side. Write the left hand side as a square: \[(x+4)^2 = 14\] Eliminate the exponent on the left hand side. Take the square root of both sides: \[x+4 = sqrt(14) \] Look at the first equation: Solve for x.
eSpeX
  • eSpeX
@fernmndez that is completing the square, the instructions state to use the quadratic formula. \[\frac{-b\pm\sqrt{b^2-4ac}}{2a}\]
anonymous
  • anonymous
@eSpeX :( Sorry. I might've had a minor stroke. Not sure how I missed that..

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goformit100
  • goformit100
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anonymous
  • anonymous
Can anybody use the write right formula and help me because i'm confused
anonymous
  • anonymous
@fernmndez maybe you can help me with this one Solve x2 + 4x – 12 = 0 by completing the square. Show your work for full credit.
eSpeX
  • eSpeX
That is the right formula. All you need do is place the coefficients in your equation into the formula. You have the form of \(ax^2+bx+c=0\)
anonymous
  • anonymous
@eSpeX thank you
eSpeX
  • eSpeX
You're welcome.

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