Question

The function f(x) = −x^2 − 7x + 30 shows the relationship between the vertical distance of a diver from a pool's surface f(x), in feet, and the horizontal distance x, in feet, of a diver from the diving board. What is a zero of f(x), and what does it represent?

x = 10; the diver hits the water 10 feet away horizontally from the board
x = 3; the diver hits the water 3 feet away horizontally from the board
x = 10; the diver jumps in the pool at 10 feet per second
x = 3; the diver jumps in the pool at 3 feet per second

Answer 1

@iGreen @soprano.h.d0816

Answer 2

i think its B...

Answer 3

@mathmale @Bowtie_man123 @AloneS

Answer 4

x2
= −(−7) + √ (−7)2 − 4×1×30
2×1
= 7 + √ 71 i
2
≈ 3.5 + 4.213075i

Answer 5

http://www.bing.com/search?q=quadratic+calculator&qs=n&form=QBRE&pq=quadratic+calc&sc=8-14&sp=-1&sk=&ghc=2&cvid=B05D52DBA5974E57B1E4EB0A63F21773

Answer 6

here is the anwser if u want to know

Answer 7

b?

Answer 8

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Answer 9

yes