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Popular >

expand (3x-9)^2

Solution

expand

(3 x - 9)^{2}

Solution

9 x^{2} - 54 x + 81

Solution steps

(3 x - 9)^{2}

Apply Perfect Square Formula:

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

(3 x - 9)^{2} = (3 x)^{2} - 2 \cdot 3 x \cdot 9 + 9^{2}

= (3 x)^{2} - 2 \cdot 3 x \cdot 9 + 9^{2}

Simplify

(3 x)^{2} - 2 \cdot 3 x \cdot 9 + 9^{2} : 9 x^{2} - 54 x + 81

= 9 x^{2} - 54 x + 81

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Frequently Asked Questions (FAQ)

What is expand (3x-9)^2 ?
The solution to expand (3x-9)^2 is 9x^2-54x+81