Solve x2 + 4x + 8 = 0.
2 answers:
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Answer: 3
Step-by-step explanation:
as you see c is the hypotenuse of the triangle that has two of the side 6 and 3
c^2=a^+b^2
c^2= 3^2+6^2
c^2=9+36
c^2=45
c= =3
Answer:
Therefore,
The ball strike the ground at time , t = 6 s
Step-by-step explanation:
Given:
The equation for the ball’s height, h, at time t seconds is
To Find:
time, t = ? (When the ball strike the ground)
Solution:
When the ball strike the ground height, h will be ZERO,
So put h = 0 in above given equation for time,
Which is a Quadratic Equation
Dividing throughout by - 4.9 we get
On Factorizing, splitting the middle term we get
As time cannot be negative,
t = 6 s
Therefore,
The ball strike the ground at time , t = 6 s