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Popular >

expand (a-9)^2

Solution

expand

(a - 9)^{2}

Solution

a^{2} - 18 a + 81

Solution steps

(a - 9)^{2}

Apply Perfect Square Formula:

(a - b)^{2} = a^{2} - 2 ab + b^{2}

(a - 9)^{2} = a^{2} - 2 a \cdot 9 + 9^{2}

= a^{2} - 2 a \cdot 9 + 9^{2}

Simplify

a^{2} - 2 a \cdot 9 + 9^{2} : a^{2} - 18 a + 81

= a^{2} - 18 a + 81

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Frequently Asked Questions (FAQ)

What is expand (a-9)^2 ?
The solution to expand (a-9)^2 is a^2-18a+81