If h(x)=x2−4x+7h(x) = x^2 - 4x + 7h(x)=x2−4x+7, find h(a−2)h(a-2)h(a−2).
a2−8a+19a^2 - 8a + 19a2−8a+19
a2−4a+3a^2 - 4a + 3a2−4a+3
a2−8a+7a^2 - 8a + 7a2−8a+7
a2−4a+19a^2 - 4a + 19a2−4a+19