If $a$ and $b$ are zeroes of $x^{2} - 5 x + 4$ , find the value of
$a^{2} b + a b^{2}$

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Solution

now, $a^{2} b + a b^{2}$
$a b (a + b)$
$= 4 \times 5$
$= 20$
Hence, this is the answer.

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