Question

How do you work this out ? h= -16t²+64+0=0

Answer 1

h = -16t² + 64 + 0
-16t² + 64 + 0
t = -64 +/- √(64² - 4(-16)(0))
2(-16)
t = -64 +/- √(4096 + 0)
-32
t = -64 +/- √4096
-32
t = -64 +/- 64
-32
t = -64 + 64 t = -64 - 64
-32 -32
t = 0 t = -128
32 -32
t = 0 t = 4
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h = -16t² + 64t + 0 h = -16t² + 64t + 0
h = -16(0)² + 64(0) + 0 h = -16(4)² + 64(4) + 0
h = 16(0) + 0 + 0 h = -16(16) + 256 + 0
h = 0 + 0 + 0 h = -256 + 256 + 0
h = 0 + 0 h = 0 + 0
h = 0 h = 0
(t, h) = (0, 0) (t, h) = (4, 0)

Answer 2

add 64 and 0
then add 16t^2 from =0
then you should have h= 16t^2=64
then take the square root of both 16t^2 and 64
then you should have 4t +- 8
that should give you your answer