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Mathematics 20 Online
OpenStudy (anonymous):

a rectangle has a width of (x+3) and an area of (x^2+8x+15). what is the length

OpenStudy (anonymous):

pls explain

OpenStudy (kc_kennylau):

Do you know how to factorize \(x^2+8x+15\)?

OpenStudy (anonymous):

yes

OpenStudy (kc_kennylau):

then what do you get after factorizing it?

OpenStudy (anonymous):

(x+5)(x+3)

OpenStudy (kc_kennylau):

Then do you know the answer?

OpenStudy (anonymous):

nope

OpenStudy (kc_kennylau):

Ok if a rectangle has an area of \(48cm^2\) and a width of \(6cm\), what's its length?

OpenStudy (anonymous):

8cm

OpenStudy (kc_kennylau):

how did you get that?

OpenStudy (anonymous):

ohhh so you divide the area by the width

OpenStudy (kc_kennylau):

exactly :D

OpenStudy (kc_kennylau):

so do you know the answer now? :)

OpenStudy (anonymous):

thankss :D

OpenStudy (kc_kennylau):

what's the answer? :)

OpenStudy (anonymous):

(x+5)

OpenStudy (kc_kennylau):

BINGO :D

OpenStudy (anonymous):

YAY :O

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