GWD6-5

nicole697

Q5:

If b, c, and d are constants and x² + bx + c = (x + d)² for all values of x, what is the value of c?

(1)     d = 3

(2)     b = 6

                  

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

答案是D，但我选的是A,请问怎么算出2是可以的呢？谢谢

nicole697

SOS

jh1904

x² + bx + c = (x + d)²

bx = 2dx, 2d = 6, d=3, c=9

nicole697

明白了，谢谢