ieshapettis
ieshapettis
08-05-2014
Mathematics
Answered
Solve x2-14x+21=0 by completing the square
Answer :
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
VIEW ALL ANSWERS ( 19+ )
Other Questions
Political parties are primarily defined in which of the following ways A a candidate B a state C a law D an issue
wat would happen if both cold air masses had the same temperature
Huntingtons disease is due to an autosomal dominant allele If a heterozygous male marries a normal female what percentage of the offspring will have Huntingtons
is it possible to draw a triangle with the sides 150 10 and 10
In general Loyalist support for Britain was weakest in
sequence 4163664100
how do i solve this23 divided by 87
where is 112 inches on a ruler
Find the equation of the circle that satisfies the given conditions Radius 2 and center 4 7
Measure if how far an object has moved