Question

फाइंड द डिस्प्लेसमेंट ऑफ द फॉलोइंग क्वेश्चन टू एक्स स्क्वायर प्लस एक्स माइनस 4 इज इक्वल टू जीरो​

Answer 1

Answer:

Solving x2-x-4 = 0 by the Quadratic Formula .

According to the Quadratic Formula, x , the solution for Ax2+Bx+C = 0 , where A, B and C are numbers, often called coefficients, is given by :

- B ± √ B2-4AC

x = ————————

2A

In our case, A = 1

B = -1

C = -4

Accordingly, B2 - 4AC =

1 - (-16) =

17

Applying the quadratic formula :

1 ± √ 17

x = —————

2

√ 17 , rounded to 4 decimal digits, is 4.1231

So now we are looking at:

x = ( 1 ± 4.123 ) / 2

Two real solutions:

x =(1+√17)/2= 2.562

or:

x =(1-√17)/2=-1.562

Two solutions were found :

x =(1-√17)/2=-1.562

x =(1+√17)/2= 2.562