Question 48112
f(x)= 3x(2x-1)
f(-1)= 3(-1)(2(-1))-1)
f(-1)= -3(-2-1)
f(-1)= -3(-3)
f(-1)= 9
.
Check by plugging in y = 9 and x = -1
y=3x(2x-1)
9=3(-1)(2(-1)-1)
9=-3(2(-1)-1)
9=-3(-2-1)
9=(-3)(-3)
9=9