F(x)= 10x-5
What is the value of f-1(-4) ?

Explanation:

Firstly finding

So,

Substitute

Exchange the values of x and y

Solving for y

Adding 5 to both sides

Dividing both sides by 10

Replace

For x = -4

Explanation:

f(x) = y (output)

y = 10x - 5

Switch variables.

Solve for y.

x = 10y - 5

x + 5 = 10y

x/10 + 1/2 = y

= 1/10x + 1/2

Put x as -4.

1/10(-4) + 1/2

-4/10 + 1/2

-4/10 + 5/10

= 1/10

no. dot product   =0 when vecs at right angles

e/c, where e is its total energy