Where does the graph of y = 2x2 + x − 15 cross the x-axis?

(−3 over 2, 0) and (5, 0)

(3 over 2, 0) and (−5, 0)

(−5 over 2, 0) and (3, 0)

(5 over 2, 0) and (−3, 0)

Question

Where does the graph of y = 2x2 + x − 15 cross the x-axis?

 (−3 over 2, 0) and (5, 0)

 (3 over 2, 0) and (−5, 0)

 (−5 over 2, 0) and (3, 0)

 (5 over 2, 0) and (−3, 0)

akashdeepdeb · Answer

WELCOME TO OPENSTUDY!!

Okay, so for this question..

When they ask when it crosses the x-axis they are asking for the x-iINTERCEPTS
So to find the x-intercept y = 0
So
Solve the quadratic equation with x, taking y=0
Find the roots.
And the VALUES OF x WILL BE THE POINTS where it touches the x-axis! :D

Understood @omar1234? :)