EM-1570

Substitution

E Math · Secondary 4 · Medium · Substitution

The variables

x

and

y

are connected by

y=\dfrac{1}{x^2}+\dfrac{1}{4x}

.

When

x=-2

, what is the value of

y

?

$\dfrac{1}{8}$
$\dfrac{3}{8}$
$-\dfrac{1}{8}$
$\dfrac{1}{4}$

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