Question

The roots of the function f(x) =x^2-2x-3are shown. What is the missing number

Answer 1

x = - 1 or x = 3 are the roots

to find the roots equate f(x) to zero

x² - 2x - 3 = 0

(x - 3)(x + 1) = 0 ← factored form

equate each factor to zero and solve for x

x - 3 = 0 ⇒ x = 3

x + 1 = 0 ⇒ x = - 1