Question

if f(x)=15-2x^2 then find the tangent line

Answer 1

are u familiar with derivatives?

Answer 2

do we need a specific value of x at which we need to find the tangent equation? e.g. at x=1 the y=17-4x

Answer 3

I mean should the value of x be given in order to find the tangent line?

Answer 4

You could assume the tangent is tangent to the curve at x=x0, then y0=15-2x0^2, or the point on the curve is
(x0, 15-2x0^2).