Checkpoint: Factoring to Solve Solution

Checkpoint: Factoring to Solve Solution

Solve.

$x^{3} + 7 x = 0$

$x (x^{2} + 7) = 0 x (x^{2} - (- 7)) = 0 x (x + i \sqrt{7}) (x - i \sqrt{7}) = 0 x = \pm i \sqrt{7}, 0$

Note

Q: How can you rewrite an addition problem as a subtraction problem?

A: Subtract the opposite value (i.e. $x + a = x - (- a)$ )