3. (३+ - 20) के गुणनखण्ड ज्ञात कीजिए। RRB NTPC (फेज़-1) 2016 (1) (2 + 5) (3 - 4) (2) (x + 4) (3 - 5) (3) (3 -2) (3 + 10) (4) (3 -2) (a + 5)

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3. ( (1) x^{2}+x-20 ) ( =x^{2}+5 x-4 x-20 ) ( =x(x+5)-4(x+5) ) ( =(x+5)(x-4) )

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