factorise 441x²-169y²
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Step-by-step explanation:
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Answer:
Factors are : (21x - 13y) (21x + 13y)
Step-by-step explanation:
441x²-169y²
using identity : (a² - b²) = (a - b) x (a + b)
=> (21x)² - (13y)²
=> (21x - 13y) (21x + 13y)
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