Simplify by Using Formula : (5x - 9) (5x + 9) - Mathematics

Simplify by using formula :
(5x - 9) (5x + 9)

योग

(5x - 9) (5x + 9)
= (5x)²- (9)²
= 25x² - 81
(Using identity : (a + b) (a - b) = a² - b²).

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अध्याय 4: Expansions - Exercise 4.1

अध्याय 4 Expansions
Exercise 4.1 | Q 4.1

Factorise:

4x² + 9y² + 16z² + 12xy – 24yz – 16xz

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(999)²

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(3a – 5b – c)²