What is the axis of symmetry of the function f(x)=-(x+9)(x-21)
1 answer:
Carry out the mult.: f(x) = -[x^2 - 21x + 9x - 189]
Combine like terms: f(x) = -[x^2 - 12x - 189]
Eliminate the brackets [ ]: f(x) = -x^2 + 12x + 189
Identify coefficients a, b and c: a= -1, b=12, c=189
The equation of the axis of symmetry is x = -b/(2a), which here equals
x = -(12)/[2(-1)], or x = 6
This is also the x-coordinate of the vertex. Plug x=6 into the original equation to calculate the y-coordinate.
You might be interested in
Answer:
hhhhhshshdhdhdshsjssjjsjdjdjd
h
The answer should be D if I’m wrong
It’s 22/3 I think so that’s the answer
50.1 repeateding because that is the only positive number
