Question

X^2-4x+c find the value of c

Answer 1

`c = 4`

Explanation:

Given

`x^2 - 4x + c`

Required

Find c

The question is incomplete. However, I'll assume the expression is a perfect square.

To find c, we make use of the following formula

`c = ((b)/(2))^2`

Where

`ax^2 + bx + c`

By comparison with
`x^2 - 4x + c`

`a =1`

`b = -4`

So,
`c = ((b)/(2))^2` becomes

`c = ((-4)/(2))^2`

`c = (-2)^2`

`c = 4`

The value of c that makes the expression,
`x^2 - 4x + c` a perfect square is 4 and the expression is:
`x^2 - 4x + 4`