factorise 4/25*x2-9/49*y2
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(4x²/25)-(9y²/49)
(2x/5)² - (3y/7)²
according to the formula
a²-b²=(a+b)(a-b)
so
{(2x/5)+(3y/7)}{(2x/5)-(3y/7)}
:-) I hope it will help (-:
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