The problem is:
After much laboratory testing. it is determined that a ball thrown downward with an initial speed of 5 feet per second falls approximately d = 16t^2 + 5t feet in t seconds. Determine how long it will take for a ball to drop a distance of 159 feet.
(^ is the symbol for an exponent, right?)
Now I started by writing
159 = 16t^2 +5t
I then translated it further to
16t^2 +5t -159= 0
Then I got really stuck please can anyone help unconfuse me.
I came up with 3 seconds but really don't know how. I nedd to factor it into two binomials but I have no clue how to really get to that step or further, this is more complicated than I am used to.
2007-02-26 10:32:48 · 2 answers · asked by HDsnowlover 2 in Education & Reference ➔ Homework Help
3 is correct. It factors by FOIL to be (t - 3)(16t + 53) = 0
t could also be -53/16 but that doesn't work because time can't be negative here.
2007-02-26 10:38:54 · answer #1 · answered by hayharbr 7 · 0⤊ 0⤋
(16t + 53) x (t -3)
you have to find the factors of 159 ... which are only 1, 159 or 3, 53. then you can get the rest try that...
2007-02-26 10:42:32 · answer #2 · answered by some_old_spanish_minor_in_school 2 · 0⤊ 0⤋