Answer:
The answer to your question is:
a) f(a) + 1 = a² + 1
b) f(a + 1) = a² + 2a + 1
c) f(d + b) = d² + 2db + b²
Step-by-step explanation:
f(x) = x² + 4
a) f(a) + 1
f(a) = a²
f(a) + 1 = a² + 1
b) f (a + 1)
f (a + 1) = (a + 1)²
f(a + 1) = a² + 2a + 1
c) f (d + b) = (d + b)²
f(d + b) = d² + 2db + b²
