What are the solutions to the equation -9x^2+81=0 ?

The solutions to the equation -9x^2+81=0 are x=3,x=-3

Find the zeros of -9x^2+81=0

The zeros of -9x^2+81=0 are x=3,x=-3

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- 9 x^{2} + 81 = 0

x = 3, x = - 3

Solution steps

- 9 x^{2} + 81 = 0

Move

81

to the right side

- 9 x^{2} = - 81

Divide both sides by

- 9

x^{2} = 9

For

x^{2} = f (a)

the solutions are

x = f (a), - f (a)

x = 9, x = - 9

9 = 3

- 9 = - 3

x = 3, x = - 3

2 r^{2} - 8 r = - 64

x^{2} + 5 x + 4

x^{2} + 5 x + 7

x^{2} = - 40

(x - 5) (40 - x) = 4 (x - 5)

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