Question

What are the coordinates of the x-intercepts of the graph of y = 2x2 + 6x – 20?

Answer 1

x-int => y=0
Put y=0 into the equation.
0 = 2x^2 + 6x – 20
0 = 2 ( x^2 +3x - 10)
0 = (x+5)(x-2)
x+5 =0 or x-2 =0
Can you solve x?
After solving x, you can get the coordinates (x1, 0) and (x2, 0)