Question

Where does the graph of y = 3x2 + 14x − 5 cross the x-axis?

Answer 1

FLVS?

Answer 2

yes

Answer 3

you need to let y = 0.... and then solve the equation

0 = 3x^2 + 14x - 5

this can be factorised

Answer 4

or you can do the same with your previous problem (wit the firecracker) with the quadratic formula...

Answer 5

http://openstudy.com/study#/updates/50119db9e4b08ffc0ef3d552

Answer 6

Okay thanks guys

Answer 7

an easy method for your question is

3 x - 5 = -15 find the factors of -15 that add to 14...... 15, -1

so then its



take out common factors



which leaves

\[(x+5)(3x -1) = 0\]

just solve

x + 5 = 0

3x -1 = 0
for x