Share

Books Shortlist

# Solve the Equation 2x - 1/X = 7.Write Your Answer Correct to Two Decimal Places. - ICSE Class 10 - Mathematics

#### Question

Solve the equation 2x - 1/x = 7.Write your answer correct to two decimal places.

#### Solution

2x - 1/x = 7

=> (2x^2 -1)/x = 7

=> 2x^2 - 1 = 7x

=> 2x^2 - 7x - 1 = 0

Here a = 2, b = -7 and c = -1

:. x = (-b +- sqrt(b^2 - 4ac))/(2a)

= (-(-7) +- sqrt((-7)^2 - 4(2)(-1)))/(2(2))

= (7 +- sqrt57)/4 = (7 +- 7.55)/4

= (7 + 7.55)/4 and (7 - 7.55)/4 = 3.64 and -0.14

Is there an error in this question or solution?

#### Video TutorialsVIEW ALL [5]

Solution Solve the Equation 2x - 1/X = 7.Write Your Answer Correct to Two Decimal Places. Concept: Quadratic Equations.
S