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jfranco23: Senior | Next Rank: 100 Posts; Posts: 75; Joined: Fri Jan 16, 2009 2:00 pm; Thanked: 1 times; GMAT Score:550

by jfranco23 » Thu Mar 12, 2009 3:11 pm

If b, c and d are constants and X^2 + bx + c = (x+d)^2, what is the value of c?

1. d=3
2. b=6

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Source: Beat The GMAT — Data Sufficiency | Thu Mar 12, 2009 3:11 pm

cramya: Legendary Member; Posts: 2467; Joined: Thu Aug 28, 2008 6:14 pmFollowed by: 11 members; Thanked: 331 times

by cramya » Thu Mar 12, 2009 6:16 pm

X^2 + bx + c = (x+d)^2, what is the value of c?

1. d=3
2. b=6

X^2 + bx + c = (x+d)^2

X^2 + bx + c = x^2+2dx+d^2

Equate coefficients:

b = 2d
c = d^2

Stmt I
d=3 We can find c.

suff

Stmt II

b=6. Can find d then c.

SUFF

Choose D

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