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Blaine Melendez
Mathematics
9 November, 12:10
Nearest hundredth
X2+2x+7=21
+1
Answers (
1
)
Arjun Jackson
9 November, 12:32
0
Step-by-step explanation:
subtract 21 from both sides
x2+2x+7-21=21-21
x2+2x+14=0
use quadratic equation
x = (-3 + - (b^2-4ac) ^1/2) / 2a
in our equation a=1, b=2and c=14
(-2 + - (14+56) ^1/2) / 2
x=-1 + (60^1/2) / 2
there is only one positive answer and it is 2.87
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