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If x + 5y = 10; find the value of x3 + 125y3 + 150xy − 1000. - Mathematics

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प्रश्न

If x + 5y = 10; find the value of x3 + 125y3 + 150xy − 1000.

योग
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उत्तर

Given

⇒ x + 5y = 10

Cubing both sides we get:

⇒ (x + 5y)3 = 103

⇒ x3 + (5y)3 + 3 × x × 5y × (x + 5y) = 1000

⇒ x3 + 125y3 + 15xy × 10 = 1000

⇒ x3 + 125y3 + 150xy − 1000 = 0

Hence, x3 + 125y3 + 150xy − 1000 = 0

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अध्याय 4: Expansions (Including Substitution) - Exercise 4 (E) [पृष्ठ ६६]

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सेलिना Concise Mathematics [English] Class 9 ICSE
अध्याय 4 Expansions (Including Substitution)
Exercise 4 (E) | Q 7 | पृष्ठ ६६
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