simplfiy by removing factors of 1.
z power of 2 -8z+15
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z power of 2 2z-15
help please
z^2-8x+15= (x-3) (x-5)
z^2+2z-15= (z+5) (z-3)
To solve these, you need to find 2 numbers that add up to the number in the middle (the -8 and 2) and the same 2 numbers that multiply to the last number (15 and -15).