Question
Download Solution PDF(5z - 7y)² + (7z + 5y)² - 49z² को सरल कीजिए
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFदिया गया है:
(5z - 7y)² + (7z + 5y)² - 49z² को सरल कीजिए
प्रयुक्त सूत्र:
(a + b)² = a² + 2ab + b²
(a - b)² = a² - 2ab + b²
गणना:
(5z - 7y)2 + (7z + 5y)2 - 49z2
⇒ (25z2 - 2 × 5z × 7y + 49y2) + (49z2 + 2 × 7z × 5y + 25y2) - 49z2
⇒ 25z2 - 70zy + 49y2 + 49z2 + 70zy + 25y2 - 49z2
⇒ 25z2 + 49z2 - 49z2 + 49y2 + 25y2
⇒ 25z2 + 74y2
इसलिए, सही उत्तर विकल्प (4) है।
Last updated on Jul 17, 2025
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