Question

SOLVE :
$81 - 4x {}^{2}$
​

Answer 1

Step-by-step explanation:

Given,

81 - 4x²

= 9² - (2x)²

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

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Answer 2

Answer:

now 81-4x2 will equal to zero for some value of x so

Step-by-step explanation:

81-4x²=0

81=4x²

x²= 20 . 25

x=√20.25

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