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lukranit [14]
3 years ago
10

Compute the value of the discriminant and give the number of real solutions to the quadratic equation:

Mathematics
2 answers:
Naddika [18.5K]3 years ago
5 0
3x^2 - 7x + 9 = 0 \\ \\a=3, \ \ b=-7, \ \ c= 9 \\ \\ \Delta =b^2-4ac = 7^2 -4\cdot 3 \cdot 9 = 49-108= -59 \\ \\ If \ \Delta


dexar [7]3 years ago
3 0
ax^2+bx+c=0\\
3x^2-7x+9=0
a=3 b=-7 c=9
\Delta=b^2-4ac=(-7)^2-4*3*9=49-108=-59
\Delta
If the delta is less than zero and if no polynomial real roots
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Answer:

5000 students appeared in the examination.

Step-by-step explanation:

We solve this question using Venn probabilities.

I am going to say that:

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This means that 100 - 5 = 95% pass in at least one, which means that P(A \cup B) = 0.95

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This means that P(A) = 0.8, P(B) = 0.75

Proportion who passed in both:

P(A \cap B) = P(A) + P(B) - P(A \cup B)

Considering the values we have for this problem

P(A \cap B) = P(A) + P(B) - P(A \cup B) = 0.8 + 0.75 - 0.95 = 0.6

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3000 is 60% of the total t. So

0.6t = 3000

t = \frac{3000}{0.6}

t = 5000

5000 students appeared in the examination.

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