Use the quadratic formula to solve x2 + 7x + 8 = 0. Estimate irrational solutions to the nearest tenth.

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04-04-2017
Mathematics

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Use the quadratic formula to solve x2 + 7x + 8 = 0. Estimate irrational solutions to the nearest tenth.

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wolf1728 wolf1728 · Answer 1 · 2017-04-07T21:57:42+02:00

wolf1728 wolf1728

07-04-2017

x2 + 7x + 8
a = 1
b = 7
c = 8
x = [-b +-sq root (b^2 -4ac)] / 2a
x = [-7 +- sq root (49 -4*1*8)] / 2*1
x = [-7 +- sq root (49 -32)] / 2
x = [-7 +sq root (17)] / 2

x1 = [-7 +sq root (17)] / 2
x2 = [-7 -sq root (17)] / 2

x1 = -1.4384
x2 = -5.5616

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