Question

For which value of m does the graph of y = 18x2 + mx + 2 have exactly one x-intercept?

Answer 1

12

Explanation:

Answer 2

this will be a parabola which will just touch the x access and will be a perfect square The discrimant b^2 - 4ac will be = 0 so we have

m^2 - 4*18*2 = 0
m^2 = 144

m = +/-12

so its m = 12 or -12