Question

Identify whether each of these functions contains a minimum or a maximum

[Title] Minimum Maximum
f(x)=7x2−49
f(x)=2x2−5x+1
f(x)=−12x2+4x−5
f(x)=−3x2+4x−7

Answer 1

f(x)=7x2−49 --> min

f(x)=2x2−5x+1 --> min

f(x)=−12x2+4x−5 --> max

f(x)=−3x2+4x−7 --> max

Explanation:

If the coefficient of x² is:

Positive, it's minimum

Negative, it's maximum