What are the solutions to the equation -x^2+8x+5=0 ?

The solutions to the equation -x^2+8x+5=0 are x=4-sqrt(21),x=4+sqrt(21)

Find the zeros of -x^2+8x+5=0

The zeros of -x^2+8x+5=0 are x=4-sqrt(21),x=4+sqrt(21)

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- x^{2} + 8 x + 5 = 0

x = 4 - 21, x = 4 + 21

Decimal Notation

x = - 0.58257 \dots, x = 8.58257 \dots

Solution steps

- x^{2} + 8 x + 5 = 0

Solve with the quadratic formula

x_{1, 2} = \frac{- 8 \pm 8 ^{2} - 4 ( - 1 ) \cdot 5}{2 ( - 1 )}

8^{2} - 4 (- 1) \cdot 5 = 221

x_{1, 2} = \frac{- 8 \pm 2 21}{2 ( - 1 )}

Separate the solutions

x_{1} = \frac{- 8 + 2 21}{2 ( - 1 )}, x_{2} = \frac{- 8 - 2 21}{2 ( - 1 )}

x = \frac{- 8 + 2 21}{2 ( - 1 )} : 4 - 21

x = \frac{- 8 - 2 21}{2 ( - 1 )} : 4 + 21

The solutions to the quadratic equation are:

x = 4 - 21, x = 4 + 21

x (5 x - 8) = 13

y^{2} - 3 y - 18 = 0

1 3^{2} - 5^{2} = x^{2}

2 x^{2} + 4 x + 7

2 x^{2} + 4 x + 5

What are the solutions to the equation -x^2+8x+5=0 ?
The solutions to the equation -x^2+8x+5=0 are x=4-sqrt(21),x=4+sqrt(21)
Find the zeros of -x^2+8x+5=0
The zeros of -x^2+8x+5=0 are x=4-sqrt(21),x=4+sqrt(21)