Solve 1-2-2^2/2(2-1)

$$\frac { 1 - 2 - 2 ^ { 2 } } { 2 ( 2 - 1 ) }$$

Evaluate

$$-\frac{5}{2}=-2.5$$

Solution Steps

Subtract 2 from 1 to get -1.

$$\frac{-1-2^{2}}{2\left(2-1\right)}$$

Calculate 2 to the power of 2 and get 4.

$$\frac{-1-4}{2\left(2-1\right)}$$

Subtract 4 from -1 to get -5.

$$\frac{-5}{2\left(2-1\right)}$$

Subtract 1 from 2 to get 1.

$$\frac{-5}{2\times 1}$$

Multiply 2 and 1 to get 2.

$$\frac{-5}{2}$$

Fraction \frac{-5}{2} can be rewritten as -\frac{5}{2} by extracting the negative sign.

$$-\frac{5}{2}$$

Factor

$$-\frac{5}{2} = -2\frac{1}{2} = -2.5$$