Pre-Algebra Examples

$- x^{2} + - x^{2}$

Step 1

Replace all occurrences of

$+$

$-$ with a single

$-$ . A plus sign followed by a minus sign has the same mathematical meaning as a single minus sign because

$1 \cdot - 1 = - 1$

$- x^{2} - x^{2}$

Step 2

Subtract

$x^{2}$ from

$- x^{2}$ .

$- 2 x^{2}$