Question

16a+ {-9-3(4a2-1)}-{-4(2a+1)+(-2a2+9)-6a

Answer 1

16a² + { -9 - 3(4a² - 1) } - {-4(2a+1) + (-2a²+9)-6a}
16a² + {-9 -12a² + 3} - { -8a  -4 -2a² + 9 - 6a}
16a² + { -6 -12a² } - { -14a -2a² +5}
16a² -6 -12a² +14a +2a² -5
6a² +14a - 11