Question

The roots of the equation 9x² – bx + 81 = 0 will be equal, if the value of b is
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Answer 1

heya mate ☺

$9x ^{2} - bx + 81 = 0$

using discriminate formula :

b^2 - 4ac = 0

here, b = (-b) , a = 3 , c = 81

$so \: putting \: the \: value \\ ( - b) ^{2} - 4 \times 9 \times 81 = 0 \\ = > b - 4 \times 729 = 0 \\ = > b - 2916 = 0 \\ = > b = 2916$

✌ hope it helps u ✌

_______________♡ iTz sAnA ♡

Answer 2

Step-by-step explanation:

solution:-

the given equation is 9x²-bx+81=0

this is the form Ax²+Bx+C=0

where A=9 ,B= -b and C=81

when root of equation is equal so

D=0

now we can write as

B²-4AC=0

put the value

(-b)²-4×9×81=0

b²-2916=0

b²=2916

$b = \sqrt{2916}$

b=54

value of b=54