Question

What is the vertex form of the equation?

y = x2 + 4x – 3

A. y = (x – 2)2 – 7
B. y = (x + 2)2 – 7
C. y = (x – 2)2 + 7
D. y = (x + 2)2 + 7

Answer 1

Hint: complete the square.

Answer 2

?

Answer 3

the answer is B right?

Answer 4

Yeah you are correct.. :)

Answer 5

thanks ! could you help me with another Q ?

Answer 6

Like this..
\[y=x2+4x−3\]\[y=x2+4x+4−4−3\]\[y=x^2+4x+4-7\]Now continue it.. :)

Answer 7

Sure..

Answer 8

But did you understand how to do completing square?..

Answer 9

You live near a bridge that goes over a river. The underside of the bridge is an arch that can be modeled with the function y = –0.000475x2 + 0.851x, where x and y are in feet. How high above the river is the bridge (the top of the arch)? How long is the section of bridge above the arch?

A. The bridge is about 1,791.58 ft. above the river, and the length of the bridge above the arch is about 381.16 ft.

B. The bridge is about 1,791.58 ft. above the river, and the length of the bridge above the arch is about 895.79 ft.

C. The bridge is about 381.16 ft. above the river, and the length of the bridge above the arch is about 895.79 ft.
D. The bridge is about 381.16 ft. above the river, and the length of the bridge above the arch is about 1,791.58 ft.

Answer 10

yes i understood it.

Answer 11

You will have to find the vertex point of this graph..