joshoyen
  • joshoyen
use the information provided to write the standard form equation of each parabola. 1. y = 2(x + 7)^2 - 6
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
Astrophysics
  • Astrophysics
In this one we're going backwards, what is vertex in this?
joshoyen
  • joshoyen
is it this formula -b/2a ?
Astrophysics
  • Astrophysics
No remember what i showed you on the last one, vertex form, what is the vertex just by looking at it (h,k)

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joshoyen
  • joshoyen
ohhh
joshoyen
  • joshoyen
(-7, -6)
Astrophysics
  • Astrophysics
Right!
Astrophysics
  • Astrophysics
Ok was checking if you understood it, you just need to foil to put it in standard form y =ax^2+bx+c
Astrophysics
  • Astrophysics
\[y=2(x+7)^2-6 \] \[(x+7)^2 = (x+7)(x+7)\]
joshoyen
  • joshoyen
@Astrophysics wait i'm confused, what did you do there?
Astrophysics
  • Astrophysics
You just have to foil out the (x+7)^2 the exponent 2 means there's two of them
Astrophysics
  • Astrophysics
|dw:1450337425879:dw| multiply...
joshoyen
  • joshoyen
the answer on my paper says it's y = 2x^2 + 28x + 92
Astrophysics
  • Astrophysics
Foil it out
Astrophysics
  • Astrophysics
expand
joshoyen
  • joshoyen
i got x^2 + 7x + 7x + 49
Astrophysics
  • Astrophysics
Good now what's 7x+7x?
joshoyen
  • joshoyen
14x^2
Astrophysics
  • Astrophysics
Ok so \[y=2(x^2+14x+49)-6\]
Astrophysics
  • Astrophysics
Multiply by 2
Astrophysics
  • Astrophysics
and -6
joshoyen
  • joshoyen
ohhhh i see it now
joshoyen
  • joshoyen
@astrophysics hey could you give me another problem like this? i wanna make sure i can do it correctly
Astrophysics
  • Astrophysics
You can practice on khanacademy https://www.khanacademy.org/math/algebra/quadratics/features-of-quadratic-functions/v/quadratic-functions-2
joshoyen
  • joshoyen
oh aight thanks!

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