Freeflows

Linear System Quadruple

Let $ a, $ $ b, $ $ c, $ $ d $ be real numbers such that \begin{align*} a + b + c + d &= 1, \\ a + 2b + 4c + 8d &= 16, \\ a - 5b + 25c - 125d &= 625, \\ a + 6b + 36c + 216d &= 1296.\end{align*}Enter the ordered quadruple $ (a,b,c,d) $.

1
2
3
+
4
5
6
-
7
8
9
$\frac{a}{b}$
.
0
=
%

$a^n$
$a^{\circ}$
$a_n$
$\sqrt{}$
$\sqrt[n]{}$
$\pi$
$\ln{}$
$\log$
$\theta$
$\sin{}$
$\cos{}$
$\tan{}$

$($
$)$
$[$
$]$
$\cap$
$\cup$
$,$
$\infty$

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