anonymous
  • anonymous
Use the quadratic formula to solve x2 + 7x + 8 = 0. Estimate irrational solutions to the nearest tenth. A. {–12, 5} B. {–11.1, –2.9} C. {–5.6, –1.4} D. {–3.9, 12.1}
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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welshfella
  • welshfella
x = -7 +/- sqrt(7^2 - 4*1*8) --------------------- 2
anonymous
  • anonymous
ok
welshfella
  • welshfella
are you confident in working that out?

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More answers

anonymous
  • anonymous
i barley started to learn this, so i you can walk through it with me?
welshfella
  • welshfella
ok well use ur calculator its probably easier to work out sqrt(7^2 - 4*1*8) first this = sqrt(49 - 32) = sqrt 17
welshfella
  • welshfella
can you find sqrt17 on ur calculator?
anonymous
  • anonymous
|dw:1433007243806:dw|
welshfella
  • welshfella
yes
anonymous
  • anonymous
4 is the closest
welshfella
  • welshfella
you need to be more accurate than that - find it to the nearest hundredth
anonymous
  • anonymous
my calcuator doesnt do that!
welshfella
  • welshfella
oh ok - are you on a PC?
anonymous
  • anonymous
yes
anonymous
  • anonymous
sorry!
welshfella
  • welshfella
you can use the calculator on that anyway the answer is 4.12 so you have 2 solutions -7 + 4.12 -7 - 4.12 -------- and --------- 2 2
welshfella
  • welshfella
yw

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