For which value of m does the graph of y = 18x2 + mx + 2 have exactly one x-intercept?
Asked by maham237 @ in Mathematics viewed by 379 People
Answered by maham237 @
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
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