jen18
jen18
22-06-2014
Mathematics
contestada
Please solve equations by completing square
Respuesta :
konrad509
konrad509
22-06-2014
[tex]x^2-4x+1=0\\ x^2-4x+4-3=0\\ (x-2)^2=3\\ |x-2|=\sqrt3\\ x-2=\sqrt3 \vee x-2=-\sqrt3\\ x=2+\sqrt3 \vee x=2-\sqrt3[/tex]
[tex]x^2+6x-9=0\\ x^2+6x+9-18=0\\ (x+3)^2=18\\ |x+3|=\sqrt{18}=3\sqrt2\\ x+3=3\sqrt2 \vee x+3=-3\sqrt2\\ x=-3+3\sqrt2 \vee x=-3-3\sqrt2\\[/tex]
[tex]x^2+20x+3=0\\ x^2+20x+100-97=0\\ (x+10)^2=97\\ |x+10|=\sqrt{97}\\ x+10=\sqrt{97} \vee x+10=-\sqrt{97}\\ x=-10+\sqrt{97} \vee x=-10-\sqrt{97}[/tex]
[tex]x^2-2x-5=0\\ x^2-2x+1-6=0\\ (x-1)^2=6\\ |x-1|=\sqrt6\\ x-1=\sqrt6 \vee x-1=-\sqrt6\\ x=1+\sqrt6 \vee x=1-\sqrt6[/tex]
Answer Link
VER TODAS LAS RESPUESTAS ( 33+ )
Otras preguntas
write an equation of the line that is: a) parallel to the line y=2x-4, and has a y-intercept of 7 b) parallel to the line y-3x=6, and has a y-intercept of
find the correct sum of these geometric series.. *a1=343, an=-1, r= -1/7 *a1=80, n=7, r= -1/2 *a1= 3, a8=384, r=2 Please help me with these problems.. :(
Identify the domain and rangewith steps please (picture below)
What helps you to identify the main idea if it is not clearly stated?
how do you add fractions wiyh improper fractions
cos A/1-tan A + sin A/1-cot A =sin A + cos A
write an equation of the line that passes through the given points: there are four questions: 1) (0,-1);(6,8) 2) (3,1);(9,7) 3) (1,2);(10,14) 4) (0,0)
Alyssa is selling bags of peanuts to raise money for a fundraiser. So far, she has sold 36 bags of peanuts. This is 45% of her goal. What is Alyssa ' s goal
What ship did Christopher Columbus ride in?
bisects EOG. EOF = y + 30 and FOG = 3y – 50. Solve for y. 20704050
