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scoray [572]
3 years ago
15

No work needed!! Just answers, thank you! 25 points!!

Mathematics
1 answer:
Maurinko [17]3 years ago
3 0

Answer:

Step-by-step explanation:

S_{31} = 9 \cdot 31 + [-0.5 \cdot \frac{31(31-1)}{2}] = 46.5

S_{40} = 40 + [-3 \cdot \frac{40(40-1)}{2}] = -2300

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Determine the greatest intergral value of K for which 2x^2 - Kx +2 =0 will have non-real roots ...Use quadratic inequalities to
Mrac [35]

Answer:

Greatest integral value of K = 3.

Step-by-step explanation:

The nature of the roots of a quadratic equation is determined by the sign of the discriminant, b^2 - 4ac.  For non-real roots this is negative.

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The discriminant = (-k)^2 - 4*2*2 , so:

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The greatest integral value is 8.

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