answer:
f(1) = 7
f(4) = -2
f(x) = -x² + 2x + 6
Put x = 1
f(1) = -(1)² + 2(1) + 6
f(1) = -1 + 2 + 6
f(1) = 1 + 6
f(1) = 7
Now, Put x = 4
f(4) = -(4)^2 + 2(4) + 6
f(4) = -16 + 8 + 6
f(4) = -16 + 14
f(4) = -2
By comparing the two values, we get to know that f(1) is positive while f(4) is negative.
~~Alli~~