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Popular >

expand (3a+7)^3

Solution

expand

(3 a + 7)^{3}

Solution

27 a^{3} + 189 a^{2} + 441 a + 343

Solution steps

(3 a + 7)^{3}

Apply Perfect Cube Formula:

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

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

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

Simplify

(3 a)^{3} + 3 (3 a)^{2} \cdot 7 + 3 \cdot 3 a \cdot 7^{2} + 7^{3} : 27 a^{3} + 189 a^{2} + 441 a + 343

= 27 a^{3} + 189 a^{2} + 441 a + 343

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Frequently Asked Questions (FAQ)

What is expand (3a+7)^3 ?
The solution to expand (3a+7)^3 is 27a^3+189a^2+441a+343