fortunetellerz wrote:
Galiya wrote:
If b, c, and d are constants and \(x^2 + bx + c = (x + d)^2\) for all values of x, what is the value
of c?
(1) d = 3
(2) b = 6
of c?
(1) d = 3
(2) b = 6
[Reveal] Spoiler: Comment
I got A instead of OA D
could you explain me please why it so?
could you explain me please why it so?
ok here is what i think is the reasoning ...
expand the eqn ..\(x^2 + bx + c = x^2 + 2dx + d^2\)
cancelling the first term and comparing like terms we get
\(bx = 2dx << i.e. >>
b=2d\)
and\(c = d^2\)
now check the options we'd get both A and B to suffice ....
...
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