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WHAT IS THE ANSWER OF :

7x^2+39x+20

WHEN IT IS FACTORISED

1 answer

7 is prime, so the front has to be
(7x + ?)(x + ?)
20 = 4x5 or 1x20 or 2x10

so after about 2 trial/errors I got

(7x + 4)(x + 5)
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