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Popular >

expand (9-a)^2

Solution

expand

(9 - a)^{2}

Solution

81 - 18 a + a^{2}

Solution steps

(9 - a)^{2}

Apply Perfect Square Formula:

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

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

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

Simplify

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

= 81 - 18 a + a^{2}

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Frequently Asked Questions (FAQ)

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