Question

Select all the correct answers.

The square of a number is 3 less than four times the number. Which values could be the number?
1
О
-1
-3
3

Answer 1

1 or 3

Explanation:

If we let x represent the number, we're told that ...

x^2 = 4x -3

x^2 -4x +3 = 0

(x -1)(x -3) = 0

The number could be either of the x-values that make these factors zero.

1 or 3