Answer :

On comparing with standard quadratic equation that is

we have,


a = 1, b = 9 and c = 18


Now here,


Product ac = 118 = 18


Factors of 18; 29 and 63


Sum should be b = + 9


From above factors (+ 6x + 3x)


will give + 9x sum


therefore + 9x is replaced by ( + 6x + 3x)


Now above eq. becomes


x2 + 6x + 3x + 18


; taking x common


(x + 3)(x + 6)


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