Which shows the correct substitution of the values a, b, and c from the equation –2 = –x + x2 – 4 into the quadratic formula?

Mathematics

2 answers:

PSYCHO15rus [73]3 years ago

8 0

Answer:

D on edng

Step-by-step explanation:

CAUSE I TOOK THE TEST

Dmitrij [34]3 years ago

6 0

A quadratic equation is an equation of the form ax^2 + bx + c =0. Given the equation: -2 = -x + x^2 - 4, we write it in the form of a standard quadratic equation as follows: x^2 - x - 4 + 2 = 0 x^2 - x - 2 = 0 Comparing this with the standard quadratic equation gives that a = 1, b = -1 and c = -2 Therefore, the correct substitution of the values of a, b and c from the given equation into the quadratic formular is: x = [-(-1) + or - sqrt((-1)^2 - 4 x 1 x -2)] / (2 x 1)

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The ratio of the number of girls to the number of all students in the class is 4 to 9. Can there be 20 students in that class?

Masteriza [31]

Answer:

Step-by-step explanation:

20 ÷ 9 = 2.222222222
9 does not go evenly into 20, and there can't be a fraction of a student, so the answer is no.

I hope this helps!

3 0

3 years ago

Helppppppp 3 Σ (2n – 3) n=0

Nataly [62]

Since there are only 4 terms in the sum, it's not too much work to expand it as

$\displaystyle \sum_{n=0}^3 (2n-3) = -3 + (-1) + 1 + 3 = \boxed{0}$

Alternatively, we can use the well-known formulas

$\displaystyle \sum_{n=1}^N 1 = \underbrace{1 + 1 + \cdots + 1}_{N \text{ 1s}} = N$

$\displaystyle \sum_{n=1}^N n = 1+2+\cdots+N = \frac{N(N+1)}2$

These sums start at n = 0, so in our given sum we will keep track of the 0-th term separately:

$\displaystyle \sum_{n=0}^3 (2n-3) = -3 + \sum_{n=1}^3 (2n-3) = -3 + 2 \sum_{n=1}^3 n - 3 \sum_{n=1}^3 1 = -3 + 3\times4 - 3\times3 = 0$

as expected.

8 0

2 years ago

a scalene triangle has an area of 20.335 square centimeters. the height of the triangle is 8.3 centimeters. what is the length o

UNO [17]

Area of triangle = (1/2)*base*height

20.335 = (1/2)*base*8.3

2*20.335 = base*8.3

(2*20.335) / 8.3 = base Use your calculator.

4.9 = base

base = 4.9cm

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3 years ago

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