Solve for s4 s_4=(3(1-2^4))/(1-2)

$s_{4} = \frac{3 (1 - 2^{4})}{1 - 2}$

Simplify the numerator.

Raise $2$ to the power of $4$ .

$s_{4} = \frac{3 (1 - 1 \cdot 16)}{1 - 2}$

Multiply $- 1$ by $16$ .

$s_{4} = \frac{3 (1 - 16)}{1 - 2}$

Subtract $16$ from $1$ .

$s_{4} = \frac{3 \cdot - 15}{1 - 2}$

$s_{4} = \frac{3 \cdot - 15}{1 - 2}$

Simplify the expression.

Subtract $2$ from $1$ .

$s_{4} = \frac{3 \cdot - 15}{- 1}$

Multiply $3$ by $- 15$ .

$s_{4} = \frac{- 45}{- 1}$

Divide $- 45$ by $- 1$ .

$s_{4} = 45$

$s_{4} = 45$

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