now solve maths nrw question for class 10 maths i hope u can solve this i marked as brainlist
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78. Please find answer in attachment...
79. Let (x² + 7) = a and (2x - 1) = b.
→ 12a² - 8ab - 15b²
→ 12a² - 18ab + 10ab - 15b²
→ 6a(2a - 3b) + 5b(2a - 3b)
→ (6a + 5b)(2a - 3b)
→ {6(x² + 7) + 5(2x - 1)}{2(x² + 7) - 3(2x - 1)}
→ (6x² + 42 + 10x - 5)(2x² + 14 - 6x + 3)
→ (6x² + 10x + 37)(2x² - 6x + 17)
80. Sorry, I don't know...
81, Let (3x - 2y) = a and (3x + 2y) = b.
→ a³ - b³
→ (a - b)(a² + ab + b²)
→ {3x - 2y - (3x + 2y)}{(3x - 2y)² + (3x + 2y)(3x - 2y) + (3x + 2y)²}
→ (3x - 2y - 3x - 2y)(9x² + 4y² - 12xy + 9x² - 4y² + 9x² + 4y² + 12xy)
→ (-4y)(27x² + 4y²)
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