EM-2034

Quadratic functions

E Math · Secondary 4 · Hard · Quadratic functions

The straight line

L

has equation

y = 3x + k

. It is a tangent to the curve

y = x^2 + 4x + 1

.

What is the value of

k

?

$k = -0.75$
$k = 0.25$
$k = 0.75$
$k = 1.5$

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