bewellplus.gsu.edu
Yahne334 Yahne334
  • 26-03-2014
  • Mathematics
Answered

If x² - y² = 55, and x - y = 11, then y =

Verified Answer :

Anonymous Anonymous
  • 29-03-2014

\(x-y=11\to x=11+y\\\\x^2-y^2=55\\\\\Downarrow\ substitute\\\\(11+y)^2+y^2=55\\\\11^2+2\cdot11\cdot y+y^2+y^2-55=0\\\\2y^2+22y+121-55=0\\\\2y^2+22y+66=0\ \ \ /:2\)

\(y^2+11y+33=0\\\\a=1;\ b=11;\ c=33\\\\\Delta=b^2-4ac;\ \Delta=11^2-4\cdot1\cdot33=121-132=-11 < 0\\\\y^2+11y+33=0-false\\\\y\in\O\)

View image Anonymous
Answer Link

Related Questions

A system of different people in different lands who trade goods back and forth is called what
which is the internal membrane of the chloroplasts that is organized into flattened membranous sacs
What is 6radical v2
Bethany has 310 in nickels and dimes She has a total of 44 coins What is the value of the nickels Bethany has 090 130 180 260
what type of venom does a cottonmouth have
A foot is what percent of a yard
Whats The common denominator fractions for 12 and 14
Explain how the war in Europe brought about an economic boom in the USA
List three sets of base and height measurement for parallelograms with areas of 40 square units
The temperature at a point xy on a flat metal plate is given by Txy192x2y2 where T is measured in Celsuis and xy in meters Find the rate of change of temperatur