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3 years ago

-3√-20 written as a complex number

Mathematics

1 answer:

galben [10]3 years ago

3 0

Answer: 3√-20 = 3√20√-1 = (3√20)i

Step-by-step explanation:

√-20 can be written √20√-1 since

(√20√-1)^2 is indeed -20.

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Solve quadratic equation 10x^2+x-2=0

zhuklara [117]

Answer:

$\{-\frac{1}{2} \} \cup \{\frac{2}{5}\}$

Step-by-step explanation:

$10x^2 + x - 2 = 0; \\ a = 10, b = 1, c = -2; \\ D = b^2 - 4ac = 1^2 - 4 * 10 * (-2) = 1 + 80 = 81 = 9^2, > 0; \\ x_{1, 2} = \frac{-b \pm \sqrt{D}}{2a} = \frac{-1 \pm \sqrt{9^2}}{2 * 10} = \frac{-1 \pm 9}{20} = \left \ [ {{\frac{-1 - 9}{20} = -\frac{10}{20} = -\frac{1}{2} } \atop {\frac{-1 + 9}{20} = \frac{8}{20} = \frac{2}{5}}} \right.$

8 0

2 years ago

Factor the expression below.

Leni [432]

Answer: B

Step-by-step explanation:

When you factor an expression, you want to take out a factor of the numbers and variables.

Since this expression is a bit hard to factor as itself, we can FOIL the answers to see the correct expressions.

(4x-5)(4x-5)

16x²-20x-20x+25

16x²-40x+25

8 0

3 years ago

A rectangular prism is shown below. Find the volume. 1.3 ft 1.5 ft 2.3 ft 23 “ Your answer can be exact or rounded to the neares

Helen [10]

Answer:

4.485 ( rounded = 4.5)

Step-by-step explanation:

1.3 x 1.5 x 2.3 = 4.485

8 0

3 years ago

What are the solutions of 3x2 + 14x + 16 = 0?

nevsk [136]

Good evening ,

Answer:

x = StartFraction negative 8 Over 3 EndFraction, –2

Step-by-step explanation:

3x² + 14x + 16 = 0

3x² + 6x + 8x + 16 = 0

(3x² + 6x) + (8x + 16) = 0

3x(x+2) + 8(x+2) = 0

(x+2)(3x+8) = 0

x = -2 , x = -8/3.

5 0

3 years ago

Read 2 more answers

Please Help!!!

Komok [63]

Answer:

A = 63 m^2

Step-by-step explanation:

The area of a parallelogram is bh

A = bh

The base is 9 and the height is 7

A = 9*7

A = 63 m^2

3 0

3 years ago

Read 2 more answers