Find the discriminant of the quadratic 5x^2 - 2x + 8 - 2x^2 + 6x + 2 - 2x^2 + 4x - 1.
Find the discriminant of the quadratic 5x^2 - 2x + 8 - 2x^2 + 6x + 2 - 2x^2 + 4x - 1.
When the quadratric is in the form ax2 + bx + c the discriminant is b2 – 4ac
Rearranging terms so it's easier to see 5x2 – 2x2 – 2x2 – 2x + 6x + 4x + 8 + 2 – 1
x2 + 8x + 9
b2 – 4ac = 82 – (4)(1)(9)
= 64 – 36
D = 28
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