2 years ago

I don't get this at all and it's confusing me

1 answer:

3 0

I dont have a couculator but ill tell you how to get the answer 12÷8 then moltiply by five... then 14÷7 then moltiply by 3 then add ur first and second answer to get the final answer

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Which expression is equivelent to (-2)(a+6) -2a+6 2a+12 -2a-12 -2a+12

pogonyaev

Answer:

-2a -12

Step-by-step explanation:

a minus * a plus is a negative therefore -12

7 0

2 years ago

Derive the equation of the parabola with a focus at (−5, 5) and a directrix of y = −1. (2 points)

umka2103 [35]

Focus of the parabola is (-5,5) and directrix is y = -1.

Let's assume a point (x,y) on parabola.

According to definition of parabola, the distance between point (x,y) and focus (-5,5) would be same as the distance between the point (x,y) and directrix y = -1.

$\sqrt{(x+5)^2+(y-5)^2} = \sqrt{(y+1)^2} \\\\(x+5)^2+(y-5)^2=(y+1)^2 \\\\(x+5)^2 + y^2 - 10y +25 = y^2 +2y +1 \\\\(x+5)^2 = -y^2 +10y -25 + y^2 +2y +1 \\\\(x+5)^2 = 12y -24 \\\\12y = (x+5)^2 +24 \\\\ y = \frac{1}{12} (x+5)^2 +2$