AM-1230

Quadratic models

A Math · Secondary 4 · Easy · Quadratic models

A parabolic arch has equation

y=a(x-1)(x-9)

. The highest point of the arch is

(5,20)

. Find the value of

a

.

$-\dfrac{5}{4}$
$\dfrac{5}{4}$
$-\dfrac{4}{5}$
$\dfrac{4}{5}$

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