2 years ago

Ok here is the question I need it answered fast I'll give brainliest!

Mathematics

1 answer:

natima [27]2 years ago

3 0

Answer:

It’s C!!!

Explanation: have an amazing day!

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What does the line y=k-1/4a represent in y=a(x-h)^2+k, the standard form of equation for a parabola?

Vlad [161]

The answer should be the directrix because k represents the y-value of the vertex, and for this questions the parabola is probably facing upward, so the directrix is under the vertex.

6 0

2 years ago

Read 2 more answers

PLEASE HELP!!! I NEED THE ANSWER SOON :)

densk [106]

$y=2x \newline y= x^{2} -3$

Substitue 2x for y in the second equation:

$2x= x^{2} -3$

Rearrange to $a x^{2} +bx+c=0$ form:

$x^{2} -2x-3=0$

Factor:

$(x-3)(x+1)=0$

Zeros are $x=3$ and $x=-1$

To find y-coordinates of pts of intersection, plug these x-values into first equation to get $y=-2$ and $y=6$