ineeeeeedhalp ineeeeeedhalp

18-08-2020
Mathematics

contestada

If $(x + y)^2 = 1$ and $xy = -4$, what is the value of $x^2 + y^2$? Please Help!!

Respuesta :

LammettHash LammettHash

18-08-2020

Expanding the first expression gives

[tex](x+y)^2=x^2+2xy+y^2=1[/tex]

Since [tex]xy=-4[/tex], we have

[tex]x^2+2(-4)+y^2=1\implies\boxed{x^2+y^2=9}[/tex]

Answer Link

Otras preguntas

All of the following are major pollutants of ground water except pesticides fertilizers household chemicals chlorine from drinking water

729 is divisible by which of the following numbers 2,3,4,5,6,9 or 10

Match the authors with their literary works. 1. Catch-22 Ken Kesey 2. One Flew Over the Cuckoo's Nest Joseph Heller 3. In Cold Blood Kurt Vonnegut 4. Sla

Why does hamlet quarrel with Laertes at Ophelia’s grave? What does this conflict clarify about his feeling?

Shanice and Mofor ar selling pies for a school fundraiser. Customers can buy blueberry pies and blackberry pies. Shanice sold 14 blueberry pies and 12 blackberr

compared to a few Generations ago what are some expectations put on young adults today by Society families and young adults themselves

u= 1,2,3,4,5,6 is the universal set A= 2,4,6 and B = 1,2,3 is the following true or false? U C B

Please help on this one?

Cholrine has an average atomic mass of 35.45 amu. The two naturally occurring isotopes of chlorine are chlorine-35 and chlorine-37. do most chlorine atoms conta

which values of "P" and "Q" result in an equation with no solution.-68x+P=Qx+34choose all answers that applyA: P=68 and Q= - 68B: P=34 and Q= - 68C: P= -68 and