webbjalia04
02.11.2020 •
Mathematics
HELP ME I KEEP GOING DOWNNNN
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Ответ:
Step by step exploration
x^2+4x-21=0
x^2+4x+4-25=0
(x+2)^2-25=0
(x+2)^2=25
X+2=+OR-5
x=-7 or x=3