25-04-2014
Mathematics

contestada

solve quadratic equation by completing the square
x²+2x-15=0

Respuesta :

Аноним Аноним

25-04-2014

[tex]x^2+2x-15=0\\\\x^2+2x\cdot1+1^2-1^2=15\\\\(x+1)^2-1=15\\\\(x+1)^2=15+1\\\\(x+1)^2=16\iff x+1=4\ or\ x+1=-4\\\\x=4-1\ or\ x=-4-1\\\\\underline{\underline{x=3\ or\ x=-5}}[/tex]

Answer Link

Otras preguntas

You are a citizen of the country of Tahpshef, which produces many domestic kitchen appliances. Recently, Tahpshef's government lifted many trade barriers, and t

Part A The year in which the US Civil War ended was 25 percent later than the year Christopher Columbus set sail from Spain. If c represents the year Columbus s

HELP PLEASE Adding new functionality to support business strategic objectives is known as ________ maintenance.

hlo any girl id in free fire?

Ik this ain’t school related lol but I have to do this if you don’t know dis song how dare you if you do first one to answer this I maybe will give a brainlie

Who does Karabakh belongs to and why?

CAN SOMEONE PLEASEEEE HELP ME WITH THIS SCIENCE QUESTION THANK YOU!! (Explain how you got the answer)

What is the soulution to the equation 4x — 2x = 12

Help I can only find 4 metaphors and 1 similes. I need 4 of each

Prove 3(x+1)(x+7)-(2x+5)² is never positive