The vertex form of the equation of a parabola is y= 3(x-4)2 +13. What is the
standard form of the equation?
- 4x +29
O A. y-*x -3x+21
O B. y=x2-
O C. y - 1x2 - 4x +21
OD. y = 2x2-3x+29
SIM
Help help please

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

hey! so 1 (25) out of 4 (100) is 25 so your answer is 25%. it's like quarters!

x^2 + 81

we can factor this using difference of square binomials.

rewrite the equation:

x^2 - (-81)

factor:

(a^2 - b^2) = (√a^2 + √b^2)(√a^2 - √b^2)

(x^2 - (-81) = (x + √-81)(x - √-81)

we can remove the - from under the radical by multiplying it by i.

(x^2 - (-81) = (x + i√81)(x - i√81)

(x^2 - (-81) = (x + 9i)(x - 9i)

we can check our answer by using foil:

x^2 - 9ix + 9ix - 81i^2

x^2 - 81^2

i^2 = -1

x^2 + 81