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Popular >

3x^2-18x-81=0

Solution

3 x^{2} - 18 x - 81 = 0

Solution

x = 9, x = - 3

Solution steps

3 x^{2} - 18 x - 81 = 0

Solve with the quadratic formula

x_{1, 2} = \frac{- ( - 18 ) \pm ( - 18 ) ^{2} - 4 \cdot 3 ( - 81 )}{2 \cdot 3}

(- 18)^{2} - 4 \cdot 3 (- 81) = 36

x_{1, 2} = \frac{- ( - 18 ) \pm 36}{2 \cdot 3}

Separate the solutions

x_{1} = \frac{- ( - 18 ) + 36}{2 \cdot 3}, x_{2} = \frac{- ( - 18 ) - 36}{2 \cdot 3}

x = \frac{- ( - 18 ) + 36}{2 \cdot 3} : 9

x = \frac{- ( - 18 ) - 36}{2 \cdot 3} : - 3

The solutions to the quadratic equation are:

x = 9, x = - 3

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Frequently Asked Questions (FAQ)

What are the solutions to the equation 3x^2-18x-81=0 ?
The solutions to the equation 3x^2-18x-81=0 are x=9,x=-3
Find the zeros of 3x^2-18x-81=0
The zeros of 3x^2-18x-81=0 are x=9,x=-3