Solve Using the Quadratic Formula 16x^2+8x+1=0

$16 x^{2} + 8 x + 1 = 0$

Step 1

Use the quadratic formula to find the solutions.

$\frac{- b \pm \sqrt{b^{2} - 4 (a c)}}{2 a}$

Step 2

Substitute the values $a = 16$ , $b = 8$ , and $c = 1$ into the quadratic formula and solve for $x$ .

$\frac{- 8 \pm \sqrt{8^{2} - 4 \cdot (16 \cdot 1)}}{2 \cdot 16}$

Step 3

Simplify.

Simplify the numerator.

Raise $8$ to the power of $2$ .

$x = \frac{- 8 \pm \sqrt{64 - 4 \cdot 16 \cdot 1}}{2 \cdot 16}$

Multiply $- 4 \cdot 16 \cdot 1$ .

Multiply $- 4$ by $16$ .

$x = \frac{- 8 \pm \sqrt{64 - 64 \cdot 1}}{2 \cdot 16}$

Multiply $- 64$ by $1$ .

$x = \frac{- 8 \pm \sqrt{64 - 64}}{2 \cdot 16}$

Subtract $64$ from $64$ .

$x = \frac{- 8 \pm \sqrt{0}}{2 \cdot 16}$

Rewrite $0$ as $0^{2}$ .

$x = \frac{- 8 \pm \sqrt{0^{2}}}{2 \cdot 16}$

Pull terms out from under the radical, assuming positive real numbers.

$x = \frac{- 8 \pm 0}{2 \cdot 16}$

$- 8$ plus or minus $0$ is $- 8$ .

$x = \frac{- 8}{2 \cdot 16}$

Multiply $2$ by $16$ .

$x = \frac{- 8}{32}$

Cancel the common factor of $- 8$ and $32$ .

Factor $8$ out of $- 8$ .

$x = \frac{8 (- 1)}{32}$

Cancel the common factors.

Factor $8$ out of $32$ .

$x = \frac{8 \cdot - 1}{8 \cdot 4}$

Cancel the common factor.

$x = \frac{8 \cdot - 1}{8 \cdot 4}$

Rewrite the expression.

$x = \frac{- 1}{4}$

Move the negative in front of the fraction.

$x = - \frac{1}{4}$

Step 4

The final answer is the combination of both solutions.

$x = - \frac{1}{4}$ Double roots