Question

How do you factor `x²-10x+21`?

Answer 1

`x^2-10x+21=(x-3)(x-7)`

Explanation:

`x^2-10x+21`

Find two numbers that when added equal `-10`, and when multiplied equal `21`.

The numbers `-3` and `-7` meet the criteria.

`x^2-10x+21=(x-3)(x-7)`