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#26 2017-08-27 05:37:34

Thompsonnn
Member
Registered: 2017-08-01
Posts: 21

Re: Solving Quadratics by Factoring and Graphing

t+8 t-3

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#27 2017-08-27 07:07:23

zetafunc
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Registered: 2014-05-21
Posts: 2,125
Website

Re: Solving Quadratics by Factoring and Graphing

The quadratic equation
has solutions
and
This is because when you replace
with
into the equation, you get:

Similarly:

So when we plug
and
into the left-hand side of
, we get
-- which means that they satisfy the equation. So we can call them solutions.

Does that make sense?

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#28 2017-08-28 01:24:57

Thompsonnn
Member
Registered: 2017-08-01
Posts: 21

Re: Solving Quadratics by Factoring and Graphing

yes it does thank you!

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#29 2017-08-28 06:47:42

zetafunc
Moderator
Registered: 2014-05-21
Posts: 2,125
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Re: Solving Quadratics by Factoring and Graphing

Great! But remember to discard one of the solutions, since time cannot be negative.

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#30 2017-08-28 19:29:23

Thompsonnn
Member
Registered: 2017-08-01
Posts: 21

Re: Solving Quadratics by Factoring and Graphing

do i do number 20 the same?

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#31 2017-08-31 08:51:33

zetafunc
Moderator
Registered: 2014-05-21
Posts: 2,125
Website

Re: Solving Quadratics by Factoring and Graphing

It can probably be done in a similar way -- let us know if you have any problems.

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