Question

expand the following expression. (2x+5y)^3
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Answer 1

Answer:

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Answer 2

Answer:

$(2x + 5y) {}^{3} = (2x + 5y)(2x + 5y)(2x + 5y) \\ so \: (2x + 5y) {}^{2} + (2x + 5y) \\ therefore \: using \: identity \: (a + b) {}^{2} = a {}^{2} + 2ab + b {}^{2} \\ so \: here \: a = 2x \\ b = 5y \\ so \: putting \: formula \: = (2x) {}^{2} + 2 \times 2x \times 5y + (5y) {}^{2} + (2x + 5y) \\ = 4x {}^{2} + 20xy + 25y {}^{2} + (2x + 5y) \\ mltiply \: the \: number \: \\ = 4 x{}^{2} (2x + 5y) + 20xy(2x + 5y) + 25y {}^{2} (2 x + 5y) \\ 8x {}^{3} + 20x {}^{2} y + 40x {}^{2}y + 100xy + 50xy {}^{2} + 125y {}^{3}$

your answer is here

Step-by-step explanation:

ok