bellanaflaherty bellanaflaherty

23-01-2020
Mathematics

contestada

make a question similar to the one below:
for example:
Solve this quadratic equation: x^2 = 81

and then solve it and explain how you did it.

Respuesta :

ghanami ghanami

23-01-2020

Answer:

two solutions : 9 ; -9

Step-by-step explanation:

x²=81

means : x² - 81 =0 but 81 = 9²

use identity ; a² - b² = (a-b)(a+b)

x² -9² = 0 : (x-9)(x+9)=0

x-9=0 or x+9 = 0

x =9 or x = -9

Answer Link

Otras preguntas

The product of a + 3 and –2a2 + 15a + 6 is –2a3 + xa2 + 51a + 18. Find the value of x? a. 3 b. 9 c. 12 d. 15

Why are the French forced to surrender to the British in September 1801?

Jim is in a crowd of people at the mall looking for his girlfriend Tammy, who was supposed to meet him for dinner. Jim realizes Tammy is across the room as he c

The new kingdom began under the rule of Ahmose. What did he accomplish that allowed for the emergence of the new kingdom? He ended abuses by provincial governme

Answer the following questions: 1. Who was the first person to calculate the circumference of the Earth and coined the word "geography"? 2. He successfully ap

What is a pastoral society?

Choose the sentence fragment. A. Dew glistened on the tiny green leaves of the young plants. B. Although some of the seeds had already sprouted, these hadn't. C

The movement of a plant's leaves to face the sun as it moves across the sky is an example of a. phototropism. b. solar tracking. c. heliotropism. d. nastic

Write as a fraction 56:120 a. 28/60 b. 7/15 c. 3/12 d. 14/28

Fungi ____________________ their food outside their bodies and then absorb it.