Seudónimo Seudónimo
  • 01-02-2021
  • Mathematics
contestada

if one zero of the quadratic polynomial x²+3x+k is 2, then the value of k is. [ ]

a) 10
b)-10
c)5
d)-5​

Respuesta :

mathstudent55
mathstudent55 mathstudent55
  • 01-02-2021

Answer:

b) -10

Step-by-step explanation:

x^2 + 3x + k = (x - 2)(x - a)

(x - 2)(x - a) = x^2 - 2x - ax + 2a = x^2 + [-2 - a)x] + 2a

-2 - a = 3

2a = k

a = -5

k = 2(-5) = -10

Answer: b) -10

Answer Link
Аноним Аноним
  • 04-02-2021

Answer:

GET READY FOR FIGHT !!!!!

Step-by-step explanation:

*Intense music in background*

Answer Link

Otras preguntas

There are six kingdoms of living things. Archaebacteria is one of these kingdoms. Which of the following are also kingdoms of living things? Choose all answers
What is one way in which tablets differ from laptops and notebooks?
pearson math r 11-5 how many rectangles in all are in the design
At which point in history did the world start seeing more farmers than hunter-gatherers
The Federalists argued that the economy was too weak under the Articles of Confederation. Which can you infer was part of their argument? Allowing the states to
The entente cordiale refers to the cooperative relationship estsablished early in the 1800s between france and
melanie wants to put ribbion around the circumfrence of a circular secetion of the city park. Ribbon comes in in rolls of 40 feet. The radius of the section of
please help on this one please
How can you apply the distributive property to factor out the greatest common factor for 40j - 16 = ?
Which of these cultures ruled over much of Central Asia for more than two centuries?