0
4x^(2) - 81
First remember the two numbers are both squared numbers.
4 = 2^(2) & 81 = 9^(2)
Hence
(2x)^(2) - 9^(2)
Next remember two squared terms with a negative(-) between them , will factor.
Hence
(2x - 9)(2x + 9)
Note the two different signs.
NB Two squared terms with a positive (+) between them does NOT factor. .
Add your answer:
Earn +20 pts
How do you factor the expression x squared minus 81?
x2-81 = (x-9)(x+9)
The square root of 81 is how much less than 7 squared?
well, the square root of 81 is 9, and seven squared is 49, so it wud be 40
What is 81 squared?
81 x 81 = 6561
What is negative 9 squared?
-9 squared = 81(-9)^2 = (-9) * (-9) = 81
How do you evaluate 81 squared?
812 = 81 x 81 = 6,561
How do you factor 4x squared minus 36x plus 81?
(2x - 9)(2x - 9) or (2x - 9)2
What is 81 minus 16 and a number squared?
There is a formula for factoring the "difference of squares." In this case, the answer is (9 - 4x)(9 + 4x)
How do you factor 81 minus 25u squared?
(9 - 5u)(9 + 5u)
How do you factor the expression x squared minus 81?
x2-81 = (x-9)(x+9)
How do you factor 2xcubed minus x squared minus 162x minus 81?
I believe it is prime as you have written it. change the end to + 81 and it factors as (2x - 1)(x-9)(x+9)
Factor 9x squared minus 6xy plus y squared minus 81?
9x2 - 6xy + y2 - 81 = (3x - y)2 - 81 = (3x - y - 9)*(3x - y + 9)
How do you factor 4x-81?
85
How do you factor 16x2 72 81?
If that's 16x2 + 72x + 81, that factors to (4x + 9)(4x + 9) or (4x + 9)2
Factor 9x squared - 6xy plus y squared - 81?
Type your answer here... 81
What is nine squared times two minus four squared?
81 x 2 - 16 = 146
What is 9x squared minus 6xy plus y squared minus 81 factored as?
9x2 - 6xy + y2 - 81 = (3x - y)2 - 92 = (3x - y - 9)(3x - y + 9)
What is the solutions to y plus 3 squared minus 81?
78 minus78
