Find the discriminant of the quadratic 5x^2 - 2x + 8 - 2x^2 + 6x + 2.
Find the discriminant of the quadratic 5x^2 - 2x + 8 - 2x^2 + 6x + 2.
When a quadratic equation is in the form ax2 + bx + c = 0
the discriminant is given by b2 – 4c. So, combine terms: 5x2 – 2x + 8 – 2x2 + 6x + 2
3x2 + 4x + 10
D = 42 – (4)(3)(10)
= 16 – 120
= – 104
Note that solutions to a quadratic with a negative discriminant are imaginary numbers.
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