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যদি $a=15$ হয়, তবে $8a^3+60a^2+150a+130$ এর মান কত?

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দেওয়া আছে,
$a=15$

প্রদত্ত রাশি,
$8a^3+60a^2+150a+130$

$=8a^3+60a^2+150a+125+5$

$=\left(2a\right)^3+3\cdot(2a)^2\cdot5+3\cdot2a\cdot(5)^2+\left(5\right)^3+5$

$=\left(2a+5\right)^3+5$

$=\left(2\times15+5\right)^3+5$
[ মান বসিয়ে ]

$=\left(30+5\right)^3+5$

$=\left(35\right)^3+5$

$=42875+5$

$=42880$ [Answer]

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