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How do you simplify this expression? 

15z² - (3z - 1) (4z - 1) + 1

(The answer should be 3z² + 7z, I just don't understand how.)

Thankful for help.

 Jan 22, 2019
 #1
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https://web2.0calc.com/questions/15z-3z-1-4z-1-1

 

Please do nto post questions more than once      cheeky

 Jan 22, 2019

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