alexzigg99
alexzigg99
25-04-2017
Mathematics
contestada
solve for x x2+4x-21=0
Respuesta :
mohabbasem
mohabbasem
25-04-2017
First you calculate the determinant:
d=b^2-4ac
d=4^2-4*1*(-21)=16+84=100
Because d>0 there are two solutions for x:
x_1 = (-b+√d)/2a = (-4+√100)/2*1 = 6/2 = 3
x_2 = (-b-√d)/2a = (-4-√100)/2*1 = -14/2 =-7
The solutions for x is x = 3 and x = -7
Answer Link
VER TODAS LAS RESPUESTAS ( 35+ )
Otras preguntas
Purpose: Share an important event in your life that significantly changed you, your view about life, your life goals, or your character for the better. List pos
How can electrical conductivity be used to determine bond type? (In your CER make sure to also explain why different bonds behave differently) 1 claim 3 reasoning
In the interview in the ""introduction to marketing""-lecture on 09/13/22 a company representative of fidelity described how fidelity segments their markets. Ba
A redwood tree has a diameter of 30.2 feet. Lyndell says this tree has a smaller diameter than a tree with a diameter of 30.20 because 2 is less than 20. Is Lyn
2. 346.28 to the nearest tenth. 4. 1,672.56 to the nearest whole number. 5.163 to the nearest tenth. 7. 8. 39.22 to the nearest tenth. 9. 54.899 to the nearest
I DONT UNDERSTAND PLEASE HELP (Fill in the "#" with the right numbers)
Which inequality is represented by the graph?
what is superreacttionary
Explain how to find the number of zeros in the product for Exercise 14
Prompt Write a compare-and-contrast analysis to compare the way two different texts present similar ideas.