Answer:
f(f(x)) = 27 + 18x² + 4
Step-by-step explanation:
To find f(f(x)) substitute x = f(x) into f(x) , that is
f(3x² + 1)
= 3(3x² + 1)² + 1 ← expand parenthesis using FOIL
= 3(9 + 6x² + 1) + 1 ← distribute parenthesis by 3
= 27 + 18x² + 3 + 1 ← collect like terms
= 27 + 18x² + 4
Answer:
<em>A. 10</em>
Step-by-step explanation:
Answer:
Rate of interest = 6.9 %
Step-by-step explanation:
Given in question as,
principal invested = $10000
Interest credited = $ 690
Time taken for the Principal amount = 1 year
Now the interest is applies on simple interest
SO, simple interest =
Or, SI =
Or, 690 =
∴ Rate =
Hence Rate of interest= 6.9 % Answer