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15z² - (3z - 1) (4z - 1) + 1

 

In a calculation like this, are you supposed to change the minus inside both parantheses to plus?

 Jan 22, 2019
 #1
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deleted.

 Jan 22, 2019
edited by Guest  Jan 22, 2019
 #2
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I'm sorry, but I didn't need to know what z was. Just how to simplify the expression. 

Guest Jan 22, 2019
 #3
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Your question does not say that the expression = 0 , so

 

15z^2 + (-1)(3z-1)(4z-1) + 1            you can change to   -3z+1    or  -4z+1 but NOT BOTH (or just leave it)

 

15 z^2 + (-1)(12z^2 - 7z +1) +1

15z^2 -12z+7z-1+1

3z^2 +7z

= z(3z+7)

 Jan 22, 2019

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