factorize - 25(a+b)sq.-16(a-b)sq.
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= 25(a+b)² - 16(a-b)²
= (a+b)²{25-16}
= (a²+b²+2ab) {9}
= 9a²+9b²+18ab²
= (a+b)²{25-16}
= (a²+b²+2ab) {9}
= 9a²+9b²+18ab²
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