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}

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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}

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x = -7 +/- sqrt(7^2 - 4*1*8) --------------------- 2
ok
are you confident in working that out?

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Other answers:

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

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