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 $- x^{2}$ .

$- 2 x^{2}$