2 answers:
The pencil work in your workbook is correct,
EXCEPT for the very last number ...
The last number is (4 x 3). That's '12', not '7'.
The answer is z²+7z+12
Just use FOIL.
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EXPLANATION:
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2=-2(-4) +b
2= 8 + b
b=-6
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It's 5 to the power of 5 over 6
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