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valentinak56 [21]
3 years ago
12

Pls help me on this i don't know what to do ​

Mathematics
1 answer:
weqwewe [10]3 years ago
5 0

Answer:

D.

Step-by-step explanation:

Standard Form (Quadratic): y=ax^2+bx+c

Vertex Form (Quadratic): y=a(x-h)^2+k

Intercept Form (Quadratic): y=a(x-p)(x-q)

      p,q are x-intercepts

x-intercepts given in graph: -2,4

y=a[x-(-2)](x-4)

eqn 1: y=a(x+2)(x-4)

Plug in the given point to find 'a' : (3,-5)

-5=a(3+2)(3-4)

-5=a(5)(-1)

1=a

Substitute 'a' in to eqn 1.

y=1(x+2)(x-4)

eqn 2: y=(x+2)(x-4)

Expand eqn 2. (can use FOIL)

y=x^2-2x-8

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(I went too far in my explanation; I'm not going to erase it because I think it is important to have an example on solving these)

Step-by-step explanation:

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is the same as means equal to (=).

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I will do it both ways and you can pick your favorite.

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