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प्रश्न
Simplify:
(3a + 5b)3 − (3a − 5b)3
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उत्तर
It is known that,
a3 − b3 = (a − b)(a2 + ab + b2)
(3a + 5b)3 − (3a − 5b)3
= {(3a + 5b) − (3a − 5b)}{(3a + 5b)2 + (3a + 5b)(3a − 5b) + (3a − 5b)2}
= 10b(9a2 + 25b2 + 30ab + 9a2 + 25b2 − 30ab + 9a2 − 25b2)
= 10b (27a2 + 25b2)
= 10b × 27a2 + 10b × 25b2
= 270a2b + 250b3
संबंधित प्रश्न
Simplify:
\[\frac{8 x^3 - 27 y^3}{4 x^2 - 9 y^2}\]
Simplify:
\[\frac{m^2 - n^2}{\left( m + n \right)^2} \times \frac{m^2 + mn + n^2}{m^3 - n^3}\]
Simplify:
\[\frac{a^2 + 10a + 21}{a^2 + 6a - 7} \times \frac{a^2 - 1}{a + 3}\]
Simplify:
\[\frac{a^3 - 27}{5 a^2 - 16a + 3} \div \frac{a^2 + 3a + 9}{25 a^2 - 1}\]
Factorise:
x3 − 64y3
Factorise:
`16a^3 - 128/b^3`
Simplify:
(x + y)3 − (x − y)3
Simplify:
(a + b)3 − a3 − b3
Simplify: (a - b)3 - (a3 - b3)
Factorise the following:
a6 – 64
