Answer :
In factorization, we write the middle term of the quadratic equation either as a sum of two numbers or difference of two numbers such that the equation can be factorized.
⇒ ax2 +a2x + x + a =0
⇒ ax(x + a) + 1(x + a) = 0
⇒ (ax + 1)(x + a) = 0
⇒ x = -a, -1/a
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