6 - Formulae and Functions

Question 1

Which is an: expression, identity, formulae, equation

1. 2x + 5 = 7
2. A = (b x h) /2
3. 2x + 5
4. 2x + 5 ≡ 3x + 4

Answer 1

1. Equation
2. Formulae
3. Expression
4. Identity

Question 2

if f(x) = 3x - 2 and g(x) = x² then what is

1. f-1(x)
2. f(g(x))

Answer 2

1. fx - > x3, -2
   +2, /3 f-1(x) = (x+2) / 3
2. g(x) = x² so x² -> 3x - 2 =
   f(g(x)) = 3x² - 2