Question

find the following products (Z-3)(Z-5)​

Answer 1

Answer:

z^2-8z+15

Step-by-step explanation:

we have to first multiply z from z-5 and then -3 from z-5 .

Then we get z^2-8z+15

so this is your answer.

Answer 2

Given,

(Z-3)(Z-5)

We have to use the identity (x + a) (x - b) = x^2+ x (a – b) – ab to solve this.

Here x = Z, a = -3, b = -5

Substitute these values in the identity.

(Z-3)(Z-5) = Z^2+Z (-3-5)-3×-5

(Z-3)(Z-5) = Z^2+Z (-8)+15

(Z-3)(Z-5) = Z^2-8Z+15

Therefore the product of (Z-3)(Z-5) is Z^2-8z+15.