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B)[3x-7)2 by using identities note:the 2 is a square
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B)[3x-7)2 by using identities note:the 2 is a square

User Arjenve
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1 Answer

4 votes

Answer:

9x² - 42x + 49

Explanation:

Given

(3x - 7)² = (3x - 7)(3x - 7)

Each term in the second factor is multiplied by each term in the first factor, that is

3x(3x - 7) - 7(3x - 7) ← distribute both parenthesis

= 9x² - 21x - 21x + 49 ← collect like terms

= 9x² - 42x + 49 ← in expanded form

User Panu Haaramo
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