ieshapettis
ieshapettis
09-05-2014
Mathematics
contestada
Solve x2-14x+21=0 by completing the square
Respuesta :
Аноним
Аноним
26-07-2014
[tex]x^2-14x+21=0\\\\x^2-2x\cdot7+7^2-7^2+21=0\\\\(x-7)^2-49+21=0\\\\(x-7)^2-28=0\\\\(x-7)^2=28\iff x-7=-\sqrt{28}\ \vee\ x-7=\sqrt{28}\\\\x=7-\sqrt{4\cdot7}\ \vee\ x=7+\sqrt{4\cdot7}\\\\x=7-2\sqrt7\ \vee\ x=7+2\sqrt7[/tex]
Answer Link
VER TODAS LAS RESPUESTAS ( 47+ )
Otras preguntas
A particle with a charge of -2.7 ?C and a mass of 3.8 x 10-6 kg is released from rest at point A and accelerates toward point B, arriving there with a speed of
What did the romantics value most? A. Death, sadness, and fear B. Industry, production, and money C. Rationality, logic, and reason D. Nature, innocence, and in
Where does oxygen-rich blood go after leaving the lungs?
Cathedrals were primarily significant in everyday life because theyA. took a long time to construct.B. were paid for by ordinary people.C. introduced new archit
5. How is the total cost of a factory or other production site determined? o marginal cost plus variable cost O fixed cost plus variable cost O fixed cost plus
The slope-intercept form of the equation of a line that passes through point (–2, –13) is y = 5x – 3. What is the point-slope form of the equation for this line
Desmond wants to sell his car that he paid $8,000 for 2 years ago. The car depreciated, or decreased in value, at a constant rate each month over a 2-year perio
Help Please..............................................
France surrendered its claim to Vietnam a. when Eisenhower funded and supplied Diem’s army in 1952. b. during World War II when the Japanese drove the French
What are some arguments as to why the study of history is important? It allows people the opportunity to change their behavior. Knowing the past can help people
