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प्रश्न
Use the formula to multiply the following.
(3x − 5) (3x + 5)
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उत्तर
It is known that, (a + b) (a − b) = a2 − b2.
(3x − 5) (3x + 5)
= (3x)2 − (5)2
= 9x2 − 25
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