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Nuetrik [128]
4 years ago
12

Can anyone help me? Factorise: 81m^2-1

Mathematics
2 answers:
attashe74 [19]4 years ago
7 0

Answer:

<h2>81m² - 1 = (9m - 1)(9m + 1)</h2>

Step-by-step explanation:

81m^2-1=9^2m^2-1^2=(9m)^2-1^2\\\\\text{use}\ a^2-b^2=(a-b)(a+b)\\\\=(9m-1)(9m+1)

solmaris [256]4 years ago
3 0

Answer:

(9m-1)(9m+1)

Step-by-step explanation:

This is a difference of squares

(9m)^2-1^2

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

So the answer is (9m-1)(9m+1)

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