The expression 2x2 – 10x – 28 can be used to model the height of a ball thrown i

Mathematics
Tutor: None Selected Time limit: 1 Day

The

expression

2x2

10x

28

can

be

used

to

model

the

height

of

a

ball

thrown

in

the

air

after

x

seconds.

Use

the

quadratic

formula

provided

below

to

figure

out

how

long

will

it

take

for

the

ball

to

hit

the

ground.

Use

a

=

2,

b

=

‐10,

and

c

=

‐28.

Provide

the

positive

solution

only.

Jun 19th, 2015

Thank you for the opportunity to help you with your question!

2x^2-10x-28

2x^2-14x+4x-28

2x(x-7)+4(x-7)

(2x+4)(x-7)

x=-2 0r 7

=7

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 19th, 2015

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