Question

PLS HELP!!!!
Use vertex form to write the equation of the parabola.
https://dlap.gradpoint.com/Resz/~0.I2LUFNFI6BUyUA6.5xWQIY88HkRA2LOboVRcrfKjzgH8vTlIqbVKKGk7gzU/7234256,D53/Assets/questions/test/algebra_2/alg2part/mc049-1.jpg

Answer 1

@Vocaloid

Answer 2

any ideas? first off what's the vertex?

Answer 3

-2.-3?

Answer 4

good

so then we take

y = a(x-h)^2 + k

plug in the vertex (h,k) to get

y = a(x+2)^2 - 3

any ideas about the sign? since the parabola is facing downwards should a be negative or positive?

Answer 5

we use the other point -4,-7?

Answer 6

no, you shouldn't need to

when the parabola is facing downward the sign in front is negative

so your final equation is
y = -(x+2)^2 - 3