Rewrite the function by completing the square,
f(x) = x2 – 9x + 14
)2+

faster, im not sure why but i know it is faster

answer: 0.26

i used the calculator on google

for this case we must apply distributive property to the following expression:

the distributive property states that:

then, when applying the property we have to multiply the -2 for each term within the parenthesis: