If x = - 4, calculate 2x squared - 5

2x (-4) ^-5

-1/32768

Wired answer.

I think is right.

You just substitute the value of x in the given equation:

f (x) = 2x^2 - 5

f (-4) = 2 (-4) ^2 - 5 = 27

f (x) : a name given to the equation

f (-4) : refer to the equation when the value of the independent variable x has the value between the brackets.