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

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Mathematics

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2 August, 09:38

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

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Carley Harrell · Answer 1

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