Step-by-step explanation:
x=7 → x-7=0
-5=7+x
-5-7=x
-12=x → x+12=0
(x-7)(x+12)=0
x²-7x+12x-84=0
x²+5x-84=0
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Answers & Comments
Step-by-step explanation:
x=7 → x-7=0
-5=7+x
-5-7=x
-12=x → x+12=0
(x-7)(x+12)=0
x²-7x+12x-84=0
x²+5x-84=0