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How to factorise the difference of perfect squares. for the g on the top and j on the top

How to factorise the difference of perfect squares. for the g on the top and j on-example-1
User Quirico
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1 Answer

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Answer:

see explanation

Explanation:

A difference of two squares is factored as

a² - b² = (a - b)(a + b)

(g)

1 - 81y²

= 1² - (9y)²

= (1 - 9y)(1 + 9y)

(j)

64x² - 25y²

= (8x)² - (5y)²

= (8x - 5y)(8x + 5y)

User Dmitry Kochkin
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