Answer:
-7,1
Explanation:
x^2+14x+49=0
x^2+14x/2=0-49
x^2+7x=-49
x^2+(7x)²=-49+49
x²+7x²=0
(x+7x)²=0
√(x+7x)²=0
x+7=0
x=-7,1
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