Question

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Find the roots of the equation x2 – 2x - 8 = 0 using quadratic formula.​

Answer 1

Answer:

By quadratic formula,

x = -b ± √b² - 4ac / 2a

x = 2 ± √(-2)² - 4 (1) (8) / 2(1)

x = 2± √ 4 - 32 / 2

x = 2 + 2 - 4√2 / 2 , 2 - 2 - 4√2/2

x = 2 ( 1 - √2 ) , -2√2