Question

Quadratic equation = 9x square 2 = 81​

Answer 1

Answer:

9

x

2

−

81

=

0

Use the quadratic formula to find the solutions.

−

b

±

√

b

2

−

4

(

a

c

)

2

a

Substitute the values

a

=

9

,

b

=

0

, and

c

=

−

81

into the quadratic formula and solve for

x

.

0

±

√

0

2

−

4

⋅

(

9

⋅

−

81

)

2

⋅

9

Simplify.

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x

=

±

3

The final answer is the combination of both solutions.

x

=

3

,

−

3

Step-by-step explanation:

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Answer 2

$9 {x}^{2} = 81$

$\implies {x}^{2} = \frac{81}{9}$

$\implies {x}^{2} = 9$

$\red{\therefore x = ±3}$