0
Turn it around for my convenience.
81X^2 - 25 = 0
add 25 to each side
81X^2 = 25
divide both sides by 81
X^2 = 25/81
take square root both sides
X = sqrt(25/81
express as
X = sqrt(25)/sqrt(81)
do it
X = 5/9
----------------check in original equation
81(5/9)^2 - 25 = 0
81(25/81) - 25 = 0
25 - 25 = 0
0 = 0
checks
What else can I help you with?
Continue Learning about Math & Arithmetic
4x - 10 plus 5x equals 71?
4x - 10 + 5x = 719x = 81x = 9
How do you factor 81x-1?
82
What is the solution to x to the fourth power minus eighty one equals zero?
x4 - 81 = 0x4 = 81x = 3
What is true 15 plus 0 equals 0 15-0 equals 0 15 percent 0 equals 0 0 percent 15 equals 0?
15 percent 0 equals 0; 0 percent 15 equals 0. Both the above are true
Ab equals 0 if and only if a equals 0 or b equals 0?
yes
Related Questions
4x - 10 plus 5x equals 71?
4x - 10 + 5x = 719x = 81x = 9
How do you factor 81x-1?
82
What is the solution to x to the fourth power minus eighty one equals zero?
x4 - 81 = 0x4 = 81x = 3
What is the answer 4x-81x?
85
What is the product of (9x-8y)(9x 8y)?
If you mean (9x-8y)(9x+8y) then it is 81x^2 minus 64y^2
What is true 15 plus 0 equals 0 15-0 equals 0 15 percent 0 equals 0 0 percent 15 equals 0?
15 percent 0 equals 0; 0 percent 15 equals 0. Both the above are true
Ab equals 0 if and only if a equals 0 or b equals 0?
yes
Is xy equals 0 - x equals 0 or y equals 0 a biconditional statement?
maybe
What is 0 divided by 8 equals?
0
What is 0 divided by 6 equals?
0
If A fraction with 0 in the numerator equals to what?
It equals 0.
What is 49765 x 0 equals?
It equals 0
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