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Popular >

simplify (x+9)(x-9)-x^2

Solution

simplify

(x + 9) (x - 9) - x^{2}

Solution

- 81

Solution steps

(x + 9) (x - 9) - x^{2}

Expand

(x + 9) (x - 9) : x^{2} - 81

= x^{2} - 81 - x^{2}

Group like terms

= x^{2} - x^{2} - 81

Add similar elements:

x^{2} - x^{2} = 0

= - 81

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Frequently Asked Questions (FAQ)

What is (x+9)(x-9)-x^2 ?
The solution to (x+9)(x-9)-x^2 is -81