(4а + 5b) (а — b) = 4а2 — 5b2.
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Answer:
4a2-4ab+5ab-5b2=4a2-5b2+ab
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Answer:
(4а + 5b)(а - b) = 4а² - 5b²
4a(a - b) + 5b(a - b) = 4a² - 5b²
4a² - 4ab + 5ab - 5b² = 4a² - 5b²
4a² + ab - 5b² ≠ 4a² - 5b²
Hence, LHS ≠ RHS.
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