Question

Give the value of the maximum or minimum of the function f(x) = x2 - 1.

Answer 1

\[0\le x^2\]
\[-1\le x^2-1\]

Answer 2

easiest way is to use x = -b/2a in your question a = 1, b = 0 and c = 1

x = 0/2 x = 0... a line of symmetry at x = 0.... (the min or max in on that line)

sub into the original equation gives y = -1

the parabola is concave up so the minimum is at (0, -1)

Answer 3

awesome thank you, guys