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.
https://web2.0calc.com/questions/15z-3z-1-4z-1-1
Please do nto post questions more than once
+36916 
