let fx x22 and a 3 and b 2 What are the values of fa and

let f(x) = x2-2 and a = -3 and b = 2. What are the values of f(a) and f(b)

Solution

f(x) = x²-2 and a = -3 and b = 2

f(a) means we have to plug x = a in f(x)

f(a) = a² -2

f(a) = (-3)² - 2            //since a = -3

f(a) = 9 -2                // square of a negative number is always positive

f(a) = 7

f(b) means we have to plug \"b\" in place of \"x\" in f(x)

f(b) = b² - 2

f(b) = 2² - 2         //sonce b= 2

f(b) - 4-2

f(b) = 2