Question

Which of the given expressions results in 0 when evaluated at x = 5? A. 5x(x − 7) B. (x + 7)(x − 2) C. (x + 5)(x − 8) D. (x − 8)(x − 5)

Answer 1

i choose D. (x-8)(x-5)

Answer 2

Option D

Explanation:

The expressions are given in factor form.

Whenever any one factor is 0, expression is 0

Since x=5 we have x-5 =0

So wherever x-5 is a factor, the expressions has to be 0

Out of 4 expressions given we have

Option D is only having x-5 as factor

Hence option D expression

`(x − 8)(x − 5)=0`

when x=5

Other expressions cannot be exactly 0 since x-5 is not a factor for any other of them

So only option D is right.