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Mathematics 18 Online
jnlkmnjkm:

math problem

jnlkmnjkm:

1 attachment
jnlkmnjkm:

@Florisalreadytaken

100kpimpcess:

@Laylalyssa

100kpimpcess:

@snowflake0531

AZ:

Do you know the vertex form of a quadratic equation? y = (x-h)^2 + k where (h, k) is the vertex What is the vertex in your image?

jnlkmnjkm:

-3, 4

AZ:

Good, so h is -3 and k is 4 so y = (x - (-3))^2 + 4 x - (-3) is the same thing as x+3 So we get y = (x+3)^2 + 4 Can you expand that? What is (x+3)^2 = ?

AZ:

Remember the formula \( (a+b)^2 = a^2 + 2ab + b^2\)

jnlkmnjkm:

x^2 + 6x + 9

AZ:

Good so now we have y = (x+3)^2 + 4 y = x^2 + 6x + 9 + 4 Just simplify by adding the like terms. What is 9 + 4 = ?

jnlkmnjkm:

13

AZ:

And so what's your final answer?

jnlkmnjkm:

1 attachment
AZ:

Where did you get the 2 from?

jnlkmnjkm:

i leave it blank?

AZ:

remember that \( x^2 \) is the same thing as \( 1 x^2\) when they don't write any number in front of it, that means it's `1`

jnlkmnjkm:

1 attachment
AZ:

That's correct

AZ:

wait

jnlkmnjkm:

1 attachment
AZ:

the quadratic function is flipped

jnlkmnjkm:

lol

AZ:

so we have y = a(x-h)^2 + k and we said that (h, k) is (-3, 4) and we need to figure out what 'a' is y = a(x + 3)^2 + 4

AZ:

If you look at the graph, you can see there's a point (-2, 2) on the line so we can use that to find the value of 'a' and then we distribute just like we did earlier 2 = a(-2+3)^2 + 4 what is a = ?

jnlkmnjkm:

im not sure but i have a new uestion

AZ:

Sure, post it

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