Is it possible to factor $y = x^{2} - 21 x$ $y=x^2-21x$ ? If so, what are the factors?

Question

1832 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2017-07-29T17:03:00

See a solution process below:

It is possible to factor this equation. An $x$ $color(red)(x)$ can be factored from each term on the right side of the equation:

$y = (x \cdot x) - (x \cdot 21)$ $y = (color(red)(x) * x) - (color(red)(x) * 21)$

$y = x (x - 21)$ $y = color(red)(x)(x - 21)$

Is it possible to factor y=x^2-21x y=x2−21xy=x^2-21x ? If so, what are the factors?