12)If p and p' are the length of the perpendiculars drawn from the points (+-root a2-b2,0) to the line x/a cosA + y/b sinA = 1, prove that: p x p' = b2.

Kindly refer to below explanation.

Step-by-step explanation:

Given equation of line:

Given points are:

Formula for distance between a point and a line is:

If the point is and equation of line is

Then, perpendicular distance between line and points is:

Here,

For the first point:

By the above formula:

and can be calculated as:

Formula used:

(Using the identity:

)

(Hence provded)

x = -4

step-by-step explanation:

- 20 - 4(x + 3) = 4x

=> -20 - 4x - 12 = 4x

=> - 32 -4x = 4x

=> -32 = 4x + 4x

=> - 32 = 8x

=> -32/8 = x

=> -4 = x