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# What is the value of b + c? 1) ab + cd + ac + bd = 6 2) a +

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Intern
Joined: 26 Nov 2006
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What is the value of b + c? 1) ab + cd + ac + bd = 6 2) a + [#permalink]  31 Dec 2006, 23:31
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What is the value of b + c?

1) ab + cd + ac + bd = 6
2) a + d = 4

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For 1), how can you factor:

b(a+d) + c(a+d) = 6

into

(a+d) (b+c) = 6?

BTW, what level is this Q? Thanks!
Manager
Joined: 03 Dec 2006
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Quote:
For 1), how can you factor:

b(a+d) + c(a+d) = 6

into

(a+d) (b+c) = 6?

by + cy = y(b+c) ... right?

so just think of (a+d) as the y in the example above and you'll get:
b(a+d) + c(a+d) = (a+d) (b+c)

hope it helps!
Manager
Joined: 28 Aug 2006
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In terms of level, this was easy to medium level, factoring algebric expressions is commonly asked
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