Question

x square - 2 x minus 4 solve using by quadratic formula ​

Answer 1

Answer:

Step-by-step explanation:

Here, a=1, b=-2 and c=-4

Using quadratic formula,

-b+\-√b^2-4ac/2a

=>-(-2)+\-√(-2)^2-4×1×-4/2

=>2+\-√4+16/2

=>2+\-√20/2

=>2+\-2√5/2

=>2(1+\-√5)/2

=>1+\-√5

So roots are 1+√5 or 1-√5