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

Fill in the blanks. 1. ________ was the largest city and most important city in Afghanistan. 2. The Russian and British strategies to get control of Afghanistan
What is the size of the angle, below?​
what is the formula for finding balance length​
Help please this is khan academy
Help my son please!!!
What is the solution to this rational equation? 24/x-8=4
A doctor confirms that a patient is overweight after performing multiple tests and calculating the patient's body mass index (BMI). Which strategy will the doct
Find an equation for the line that passes through the point P(4,-2)and is parallel to the line -2x+3y=2
Given circle with radius of 5cm. Find out (a) diameter (b) perimeter (c) area
Question 4(Multiple Choice Worth 4 points) Which of the following is a rational number? √1. √2. √3, √5 O√1 O √2 O√3 √√5