Question

For (x - 1)(x - 7) to equal 0, either (x - 1) or (x - 7) must equal what?

Answer 1

`(x - 1)(x - 7) = 0`


`{x}^(2) - 8x + 7 = 0`


`{x}^(2) - 8x = - 7`


`- 7x = ( - 7)/(x)`


`x = ( - 7)/( (x)/( - 7) ) \implies x = x \implies x \in \mathbb{R}`

x is true for any number in real domain.