Question

(11z2+4z-6)+(4z-7+12z2)+(-8+13z2+4z)​

Answer 1

Answer: $36z^2+12z-21$

Step-by-step explanation:

 You need to remember the multiplication of signs:

$(+)(+)=+\\(+)(-)=-\\(-)(-)=+$

In order to simplify the given the expression:

 $(11z^2+4z-6)+(4z-7+12z^2)+(-8+13z^2+4z)$

You must distribute signs:

$=11z^2+4z-6+4z-7+12z^2-8+13z^2+4z$

And finally, you must add the like terms:

$=36z^2+12z-21$