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 ( 85+ )
Otras preguntas
difference between Kinetic energy and potential energy
High-quality, government funded schools in Australia are an example of its investment in Question 6 options: A. capital goods B. trade barriers C. human capi
Find the area of the parallelogram
Ben played at a friends house for 2 hours and 35 minutes.Later he played at a park.He played for a total of 3 hours 52 minutes that day. How long did Ben play a
What did Germany Italy Japan and the Soviet Union have in common during the WW 11 era
Y’all I need help please
Paid advertising, relationship marketing, word of mouth, internet marketing, and diversity marketing are all strategies that could be included in which part of
What is the area of the regular polygon?
graph x+y=8 and x-y=4
Consider that the roots of a cubic equation with integral coefficients are 1, −2, and 3. Which choice is a factor of the cubic equation? A) x + 2 B) x + 1 C)
