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Popular >

expand (x+7)^3

Solution

expand

(x + 7)^{3}

Solution

x^{3} + 21 x^{2} + 147 x + 343

Solution steps

(x + 7)^{3}

Apply Perfect Cube Formula:

(a + b)^{3} = a^{3} + 3 a^{2} b + 3 a b^{2} + b^{3}

(x + 7)^{3} = x^{3} + 3 x^{2} \cdot 7 + 3 x \cdot 7^{2} + 7^{3}

= x^{3} + 3 x^{2} \cdot 7 + 3 x \cdot 7^{2} + 7^{3}

Simplify

x^{3} + 3 x^{2} \cdot 7 + 3 x \cdot 7^{2} + 7^{3} : x^{3} + 21 x^{2} + 147 x + 343

= x^{3} + 21 x^{2} + 147 x + 343

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Frequently Asked Questions (FAQ)

What is expand (x+7)^3 ?
The solution to expand (x+7)^3 is x^3+21x^2+147x+343