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Step-by-step explanation:
1 . x²+9x+18 (factors of 18=3×9)
=x²+3x+6x+18
=x(x+3)+6(x+3)
=(x+3)(x+6)
=>x=-3 or -6
2. x²+12x+36
=x²+6x+6x+36
=x(x+6)+6(x+6)
=(x+6)(x+6)
=>x=-6
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