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 ( 58+ )
Otras preguntas
Please help me in 3 & 4 !!
Wie viele Juden töteten die Natzis im Zweiten Weltkrieg ?
Why is Nelson Mandela widely regarded as the most significant black South African leader of the late twentieth century?
The school band sold 3,305 raffle tickets to raise money for a trip to Disney World. Which equation shows the relationship between the threes in the number of t
correct the pronoun agreement error in the sentence. :everybody will bring their lunch on the field trip.
The school band sold 3,305 raffle tickets to raise money for a trip to Disney World. Which equation shows the relationship between the threes in the number of t
Standard form of 5.93e-5
round 23,421 to the nearest thousand and ten thousand
Look at the triangle. What is the value of cos x°? a. 8 ÷ 17 b. 17 ÷ 8 c. 15 ÷ 17 d. 8 ÷ 15
What was Rafael Trujillo's regime really like?
