b^2 - 4ac
Is the discriminant.
6^2 - 4(3)(5)
36 - 60 = - 24 < 0
so, an unreal answer and no real X intercepts
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21x3-35x2+14x = 7x(3x2-5x+2)
The discriminant, ( first positive 4 in the constant, then negative 4 as you did not specify this ) b2 - 4ac ------------ (- 7)2 - 4(3)(4) 49 - 48 = 1 ============a positive number means two real roots ( - 4 now ) ( - 7)2 - 4(3)(- 4) 49 + 48 = 97 ============still positive and two real roots
It is of the 2nd degree.
16? using 16, you have (3x2 + 4)(3x2 + 4) = 9x2 + 24x + 16