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प्रश्न
Use a formula to multiply of (4z – 5y)(4z + 5y)
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उत्तर
We use the formula:
(x − a)(x + a) = x2 − a2
(4z – 5y)(4z + 5y)
= (4z)2 − (5y)2
= 16z2 − 25y2
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