Negative Property of Multiplication — Definition & Examples

Let $a$ be the result of multiplying $2$ by four consecutive $(-1)'s:$ $$2\cdot\left(-1\right)\cdot\left(-1\right)\cdot\left(-1\right)\cdot\left(-1\right)$$

Let $b$ be the result of multiplying $2$ by five consecutive $(-1)'s:$ $$2\cdot\left(-1\right)\cdot\left(-1\right)\cdot\left(-1\right)\cdot\left(-1\right)\cdot\left(-1\right)$$