makayla63 makayla63

21-06-2017
Mathematics

contestada

Solve by completing the square a^2 + 10a+21=0

Respuesta :

texaschic101 texaschic101

21-06-2017

a^2 + 10a + 21 = 0
a^2 + 10a = -21
a^2 + 10a + 25 = -21 + 25
(a + 5)^2 = 4
sqrt (a+5)^2 = sqrt 4
a + 5 = (+-) 2
a = -5 (+-) 2

a = -5 + 2 = -3
a = -5 - 2 = -7

solution is : a = -3 and a = -7 <==

Answer Link

Otras preguntas

Triangle xyz has sides xy = 3", yz = 4", and xz = 5". if angle y is a right angle, and side yz is opposite angle x, what is the tan of angle x?

what are the endogenous reasons of business cycles

A ball is thrown from an initial height of 2 meters with an initial upward velocity of 20 m/s. The ball's height h (in meters) after t seconds is given by h=2+2

Article I, Section 8 of the Constitution lists _____ of Congress. the implied powers the delegated powers the legislative powers the expressed powers

How many clusters of 16 seconds fit into 1 hour?

english question down below

can someone help me with these 2 questions

You have a credit card with an initial balance of $3,168.00 and an interest rate of 12.75% apr. if you make no payments on the card for three months, how much i

Which of these is an accurate description of the outcome of the "Army-McCarthy Hearings" in early 1954? A) McCarthy was Court Martialed for treason. B) The Arm

Fantasy Lanes bowling alley charges each patron $3 to rent shoes plus $5 per hour for bowling. This relationship is represented by the equation y = 5x + 3. Wha