4x^2+20x+25=0 then x=?and d= ?
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Answer :-
4x² + 20x + 25 = 0
4x² + 10x + 10x + 25 = 0
2x (2x + 5) + 5 (2x + 5) = 0
(2x + 5) (2x + 5) = 0
(2x + 5)² = 0
x = -5/2 , -5/2
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