x = + or - 9
x/9 = 9/x
x squared = 81
x = +/- 9
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The expression "x subtract 9" can be written as x - 9. This means you are taking the value of x and subtracting 9 from it. For example, if x = 15, then x - 9 would be 15 - 9 = 6. Therefore, the result of x subtract 9 depends on the value of x.
x+2=9 x=9-2 x=7
'9 Cubed' means 9 X 9 X 9 9 x 9 = 81 )9 squared) Then 81 x 9 = 729 (9 cubed)
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x^4 + 8x^2 - 9 = (x^2 - 1)(x^2 + 9) = (x - 1)(x + 1)(x^2 + 9)