How to convert vertex form to factored form y = 3(x+7)^2 - 2?

AttarceScecewdft

AttarceScecewdft

Answered question

2023-02-02

How to convert vertex form to factored form y = 3 ( x + 7 ) 2 - 2 ?

Answer & Explanation

rozchytatm0p

rozchytatm0p

Beginner2023-02-03Added 8 answers

Utilize the quadratic root formula to calculate the roots after expanding the vertex form into normal quadratic form.
y = 3 ( x + 7 ) 2 - 2
= 3 ( x 2 + 14 x + 49 ) - 2
= 3 x 2 + 42 x + 145
Using the formula for determining roots (and a very sharp pencil)
- b ± b 2 - 4 a c 2 a
gives roots at
x = - 7 + 6 3
and
x = - 7 - 6 3
So x + 7 - 6 3
and
x + 7 + 6 3
are factors of the original equation
Fully factored form
y = 3 ( x + 7 ) 2 - 2
= 3 ( x + 7 - 6 3 ) ( x + 7 + 6 3 )

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