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5 votes
Solve the equation 2x²-x-8=0 ​

User Rpr
by
8.5k points

2 Answers

4 votes

Answer:


x=(-1+-√(65))/(4)

Explanation:

Using the quadratic formula,


x=\frac{-b+-\sqrt{b^(2)-4ac}}{2a}\\x=\frac{-1+-\sqrt{-1^(2)+64}}{4}\\x=(1+-√(65))/(4)\\

User Daniel Vickers
by
8.2k points
6 votes

Answer:


= x_(1) = (1 - √(65) )/(4) . x_(2) = (1 + √(65) )/(4)

Explanation:


2x ^(2) - x - 8 = 0


x = \frac{ - ( - 1)± \sqrt{( - 1 {)}^(2) } - 4 * 2 * ( - 8)}{2 * 2}


x = (1± √(1 + 64) )/(4)


x = (1± √(65) )/(4)


= x_(1) = (1 - √(65) )/(4) . x_(2) = (1 + √(65) )/(4)

User Neil Dobson
by
8.1k points

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