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Mathematics
Gay
16 January, 16:58
Z^2 - 6z+9=0 Factor and solve
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Reina Villarreal
16 January, 19:52
0
Factor because if we have
yz=0 then we can assume y and/or z=0
so factor
so the easiest way is to find what 2 numbers add to - 6 and multiply to get 9 so
we know that they must be both - because we must have x+x = (-) and x^2 = + so therefor they must be negative
factors of 9=3 and 3 so
-3 and - 3
-3+-3=-6 perfect
(z-3) (z-3) = 0
set each to zero
z-3=0
add 3
z=3
z=3 is the answer
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