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7 August, 16:13

Determine the expression that shows a difference of perfect squares and factor it, showing work.

16x2 - 81

14x2 - 49

9x2 + 100

+2
Answers (1)
  1. 7 August, 17:43
    0
    Answer is 1st option

    16x²-81

    (4x) ² - 9²

    Thus it is the difference of squares of 4x and 9

    Factorising (4x) ² - 9², we would get:

    (4x + 9) (4x - 9)

    As a² - b² = (a + b) (a - b)
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