factorise:-4x² + 81​

Answers 2

(9 + 2x) (9 - 2x)

Step-by-step explanation:

Here, - 4x² + 81

= 81 - 4x² [ we have rearranged the terms for our purpose ]

= (9)² - (2x)²

= (9 + 2x) (9 - 2x) [ we have used algebraic identity a² - b² = (a + b) (a - b) to factorize the expression ]

This is the required factorization.

Answer:

-4x²=-81

4x²=81

x²=81/4

x=√81/4

so x=2.25

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