What are the solutions to the equation 9k^2+66k+21=0 ?

The solutions to the equation 9k^2+66k+21=0 are k=-1/3 ,k=-7

Find the zeros of 9k^2+66k+21=0

The zeros of 9k^2+66k+21=0 are k=-1/3 ,k=-7

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9 k^{2} + 66 k + 21 = 0

k = - \frac{1}{3}, k = - 7

Decimal Notation

k = - 0.33333 \dots, k = - 7

Solution steps

9 k^{2} + 66 k + 21 = 0

Solve with the quadratic formula

k_{1, 2} = \frac{- 66 \pm 6 6 ^{2} - 4 \cdot 9 \cdot 21}{2 \cdot 9}

6 6^{2} - 4 \cdot 9 \cdot 21 = 60

k_{1, 2} = \frac{- 66 \pm 60}{2 \cdot 9}

Separate the solutions

k_{1} = \frac{- 66 + 60}{2 \cdot 9}, k_{2} = \frac{- 66 - 60}{2 \cdot 9}

k = \frac{- 66 + 60}{2 \cdot 9} : - \frac{1}{3}

k = \frac{- 66 - 60}{2 \cdot 9} : - 7

The solutions to the quadratic equation are:

k = - \frac{1}{3}, k = - 7

3 x^{2} - 5 = 2 x

0 = (x - 3)^{2} - 2

65 = 4.5 t^{2} + 43.5 t + 17

15 + 4 y^{2} = 17 y

12 x^{2} + 18 x - 12 = 0

What are the solutions to the equation 9k^2+66k+21=0 ?
The solutions to the equation 9k^2+66k+21=0 are k=-1/3 ,k=-7
Find the zeros of 9k^2+66k+21=0
The zeros of 9k^2+66k+21=0 are k=-1/3 ,k=-7