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# AS level Maths HELP!!! watch

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1. Sketch the curve of f(x)=3x2-6x-7
When you do the discriminant it gives you -50<0, thus meaning that there are no roots (doesn't cross the x-axis)
But apprantly according to the textbook the roots are x=1+/-root(30)/3 (after completing the square)
How is this possible is there are no roots???
2. (Original post by Anonymous)
Sketch the curve of f(x)=3x2-6x-7
When you do the discriminant it gives you -50<0, thus meaning that there are no roots (doesn't cross the x-axis)
But apprantly according to the textbook the roots are x=1+/-root(30)/3 (after completing the square)
How is this possible is there are no roots???
a = 3
b= -6
c = -7

b^2 = 36
4ac =4 * 3 * -7 = -84

b^2 - 4ac =

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