Factorise: 625 p^2-121q^2
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2
625p² - 121q²
(25p)² - (11q)²
(25p + 11q)(25p - 11q)
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5
= 625p² - 121q²
= (25p)² - (11q)²
by using formula
a² - b² = ( a + b ) ( a - b )
= (25p)² - (11q)²
= ( 25p - 11q ) ( 25p + 11q )
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