Answer:
14 and 10
Step-by-step explanation:
We have the equation x(x-4)=140. We can distribute the x to everything in the parenthesis so it's easier to work with.
x(x-4)=140
Let's move 140 to the left side, so we can solve this equation better by finding the zeros of the equation.
To find the zero, we have to find TWO values that multiply to -140 but add to -4.
(x-14)(x-10)=0
To find the zeros. make both of those parenthesis equal to zero.
x=14, 10
Faxs like a faxs machine
Step-by-step explanation:
Answer:
Step-by-step explanation:
Step One: Cancel 3x and 6x.
6x/3x = 2
Step Two: Factor x^2 + 5x + 6
(x+3)(x + 2)
Step Three: Factor x^2 + 9x + 14
(x + 2)(x +7)
Answer
2*(x + 3) / (x + 7) The (x + 2 )s cancel out
Answer:B
Step-by-step explanation:
Answer:
D) 14 seconds
Step-by-step explanation:
y = -4.9t^2 + 120t
We want to find out when y = 500
500 = -4.9t^2 + 120t
Subtract 500 from each side
500-500 = -4.9t^2 + 120t-500
0 = -4.9t^2 + 120t-500
a=-4.9 b= 120 and c = -500
Using the quadratic formula
-b ±sqrt(b^2 -4ac)
-------------------------
2a
-120±sqrt(120^2 -4(-4.9)(-500))
-------------------------
2*(-4.9)
Solving this for the two solutions
t≈5.32415
t≈19.1656
The object will be above 500 meters between these two times
19.1656 - 5.32415 = 13.84145
This is approximately 14 seconds