factorise y²+4y-21

Dear Student ,

Please find below the solution to the asked query :

y^{2} + 4 y - 21 = y^{2} + 7 y - 3 y - 21 = y (y + 7) - 3 (y + 7) = (y - 3) (y + 7) ANS . . .

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factorise y2+4y-21