6с(9с+2)-(6+с)²,при с=1/4

Question

6с(9с+2)-(6+с)²,при с=1/4

Answer 1

=54c² +12c -36 -12c -c² =53c² -36 =53*(1/4)² -36 =53/16 -36 =(53 -576)/16 = -523/16 = -32.6875