Question

Find the roots for quadratic equation: x2 – 4 = 0

Answer 1

Answer:

the answer is 02 it will help you

Answer 2

Answer:

x = ± 2.

Step-by-step explanation:

The equation x^2-4 can be written as (x-2)^2

Now the equation is of the form (a-b)2.

We know that,

(a-b)^2 = a^2-2ab+b^2

So on solving (x-2)2,

we get ,. (x-2)^2= (x)^2 -2(x*2) + (2)^2

(x-2)^2= (x)^2 -2(x*2) + (2)^2 = x^2 - 4x + 4------------(1)

Solving eq(1) using the quadratic formula ,

x = (-b +- sqrt(b2 – 4ac) ) / 2a

we get the value of x as ± 2.

ie, x = ± 2.