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7 July, 03:04

Factorise

400x^2-49y^2

+4
Answers (2)
  1. 7 July, 05:26
    0
    (20x - 7y) (20x + 7y).

    Step-by-step explanation:

    This is the difference of 2 squares;

    a^2 - b^2 = (a - b) (a + b). So:

    400x^2-49y^2

    = (20x - 7y) (20x + 7y).
  2. 7 July, 06:46
    0
    (20x + 7y) (20x - 7y)

    Step-by-step explanation:

    400x²-49y² = (20x + 7y) (20x - 7y)
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