Answer:
3
Step-by-step explanation:
I just solved this one
anothe way is undistribute the 2 first and move -14 to side
2(x^2+6x)-14=0
comlete the squer inside and add negative
2(x^2+6x+9-9)-14=0
factor perfect square
2((x+3)^2-9)-14=0
distribute
2(x+3)^2-18-14=0
2(x+3)^2-32=0
add 32 both sides
2(x+3)^2=32
divide 2
(x+3)^2=16
sqrt both sides
x+3=+/-4
minus 3
x=-4-3 or 4-3
x=1 or -7
answer is C
Answer: 
Step-by-step explanation:
Since, According to the question,
The leak in a water tank causes the water level to decrease by 
millimeter
That is , in 1 second it decreases mm
⇒ In 
seconds it will decrease 
mm
⇒ In seconds it will decrease 
mm
