Q: How do you factor the expression 81 minus M square?

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(B - A)2 - 81 or (B - A + 9)(B - A - 9) If the starting point, A, is taken as zero the the expression simplifies to (B + 9)(B - 9)

The square root of 81 is: ±9 (9 or -9)A square root is a number which, when multiplied by itself, equals the original number. As 9 x 9 = 81 and -9 x -9 = 81, the answer is plus or minus nine.

81 is the only one.

4x2-81

81 is a perfect square because 81 = 9 x 9

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x2-81 = (x-9)(x+9)

(B - A)2 - 81 or (B - A + 9)(B - A - 9) If the starting point, A, is taken as zero the the expression simplifies to (B + 9)(B - 9)

81

Since 243 = 35, the largest square factor is 34 = 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)

9 or -9

(9 - 5u)(9 + 5u)

if x is equal to the square root of 81 then x is ±9 (plus or minus 9)

Â±9 (plus or minus 9).

It is 8(80b+81) when factored

81

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