frostbytten frostbytten

12-03-2018
Mathematics

contestada

y = 2x2 - 3x - 20?
A) x = -5 and 2
B) x = 5 and -2
C) x = -2.5 and 4
D) x = 2.5 and -4

Respuesta :

yellowyarn2003 yellowyarn2003

12-03-2018

2x² - 3x - 20

40
2 20
4 10
5 8

2x² - 8x 5x - 20
2x(x - 4) 5(x - 4)
(2x + 5) (x - 4)
2x + 5 = 0 x - 4 = 0
2x = -5 x = 4
x = -5/2
C) x = -2.5 and 4

Answer Link

Otras preguntas

Which of the following is the least realistic goal for attaining and maintaining mental and emotional health? a. be sure i have a chance to do something fun ev

Which of the following is a negative effect of algal blooms on the environment? a. transport of carbon to the bottom of the ocean b. production of oxygen c. con

Katie bought some flour. She used 3/8 of it to bake bread. What percent of the flour is left?

Which of the following is not an example of a historically ethnically diverse country in Europe? a. Macedonia b. Switzerland c. Bosnia and Herzegovina d. Ir

At 5 seconds, an object's velocity is 9 meters per second. At 8 seconds, the object's velocity is 25 meters per second. Assuming a constant acceleration, what i

Statements about a square that are always true ?

Jenna flips two pennies 105 times. How many times can she expect both to come up heads?

Which of the following were the Vikings known for? a. using both swords and axes in battle b. being the only fighters across Europe to take prisoners c. b

small cubes with edge lengths of 1/4 inch will be packed into the right rectangular prism shown. How many small cubes are needed to completely fill the right re

The volume of a cylinder, found using 3.14 to approximate pi, is 50,240 cm3. The radius of the cylinder is 40 cm. What is the height of the cylinder? Express y