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Q: How Man y times12 go into 81?

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(3x - y)(3x - y) - 81

just go to coordinates x=11 y=81

89

9x2 - 6xy + y2 - 81 = (3x - y)2 - 81 = (3x - y - 9)*(3x - y + 9)

The answer is 45 and 81. To find it out you need to use double algebra. 1. (x+y)-(x-y)=90 x-x=0 y+y=2y/2= 1y=y 90/2= 45 y=45 2. (x+y)+(x-y)=162 y-y=0 x+x=2x 2x/2= 1x=x 162/2=81 3. check your work x+y-x-y=90 81+45-81-45=90- x+y+x-y+=162 81+45+81-45=162 81+45= 126 81-45=36 126+36=162 That is how you find the answer.

(y2/81)1/2 = y/9

9y-81=9*(y-9)

An equation where y = 81

81

No, -81 is not an irrational number because it can be represented in the form x/y = -81

"Ochenta y uno" is the Spanish phrase for 81.

9x^2-6xy+y^2 = (y-3x)^2 (y-3x)^2-81 -> ((y-3x)+9)((y-3x)-9)

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