myeoniez myeoniez

25-01-2020
Mathematics

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factorise the following expressions m²-9n²

Respuesta :

PollyP52 PollyP52

25-01-2020

Answer:

(m - 3n)(m + 3n).

Step-by-step explanation:

This is the difference of 2 squares, so we use the identity:

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

So m^2 - 9n^2

(m - 3n)(m + 3n).

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