Question

Given , y=-3x^(2)+30x+7
complete the square and convert the equation to y=a(x − h)^(2) + k.

Answer 1

i believe it is y=-3(x-5)^(2)+82
but im not sure i need help!

Answer 2

lets see
start with
\[y=-3x^2+30x+7\] then
\[y=-3(x^2-10x)+7\] then
\[y=-3(x-5)^2+\text{some damned number}\]

Answer 3

which we can find easily by replacing \(x\) by \(-5\) in the original expression to see what you get

Answer 4

lol

Answer 5

actually i was too busy being a wise guy
replace \(x\) by \(5\) to see what you get

Answer 6

you are correct

Answer 7

\[-3\times (5)^2+30\times 5+7=82\]

Answer 8

wait so, my first answer was right?