Question

Solve up to 2 decimal places: 3x² – x – 7 = 0.

Answer 1

this is your correct answer

Answer 2

Answer:

x = 1.70 or -1.36

Step-by-step explanation:

According to the question the given quadratic equation is: "3x² – x – 7 = 0.

Now, we have to use Sridhar Acharya formula:

x = [−b±√(b²−4ac)]/2a

Here a = +3, b = -1 and c = -7.

So, x = [−(-1)±√((-1)²−4*(3)*(-7))]/2*a

or, x = [+1±√(1+84)]/2*3

or, x = [+1±√85]/6

or, x = [+1+√85]/6    or    [+1-√85]/6

or, x = [+1+9.21]/6    or    [+1-9.21]/6

or, x = 10.21/6   or   -8.21/6

or, x = 1.70 or -1.36 [Ans]

Therefore, correct upto 2 decimal places the value of x will be either 1.70 or -1.36.