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9 June, 22:45

Factor 9y2 - 12y + 4.

(3 y - 2) (3 y + 2)

(3 y - 4) (y + 1)

(3 y - 2) 2

+1
Answers (1)
  1. 9 June, 22:53
    0
    (y - 2) ²

    Step-by-step explanation:

    9y² - 12y + 4 ← is a perfect square of the form

    (ax - b) ² = a²x² - 2abx + b²

    Compare like terms with 9y² - 12y + 4, thus

    a² = 9 ⇒ a = 3

    b² = 4 ⇒ b = 2 and

    - 2ab = - 2 * 3 * 2 = - 12

    Thus

    9y² - 12y + 4 = (3y - 2) ²
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