Question

Help please!!

Identify the vertex for the graph of y = 2x^2 + 8x - 3.

(2, 21)

(2, 17)

(-2, -11)

(-2, -27)

Answer 1

You can get the vertex by the formula -b/21, c-(b^2/41)

For the x coordinate,
-8/4 = -2

For the y coordinate,
-3 - 64/8 = -3 - 8 = -11

So, (-2, -11)

Answer 2

What @raechelvictoria said lol

Answer 3

You can also just find the x coordinate, which is 2, then substitute it to the original equation to find for the y coordinate.

Answer 4

*to find the y coordinate

Answer 5

*-2

Answer 6

OMG sorry for all the typos lol

Answer 7

haha its ok & thank you!

Answer 8

Can you help me with another one? @raechelvictoria

Answer 9

Okay sure :)

Answer 10

thanks :)

The function f(x) = -x^2 - 9x + 10 shows the relationship between the vertical distance of a diver from a pool's surface f(x), in feet, and the horizontal distance x, in feet, of a diver from the diving board. What is a zero of f(x) and what does it represent?

x = 1; the diver jumps in the pool at 1 foot per second

x = 10; the diver jumps in the pool at 10 feet per second

x = 1; the diver hits the water 1 foot away horizontally from the board

x = 10; the diver hits the water 10 feet away horizontally from the board

Answer 11

The third one.

Answer 12

You have to factor the equation, which will give us (x+10)(x-1), which gives us x=-10, 1. Since there is no negative distance, we only have x = 1 ft. The problem states that x represents horizontal distance x, which is why the third choice is the answer.

Answer 13

thanks!