heavenlee1
heavenlee1 heavenlee1
  • 13-04-2015
  • Mathematics
contestada

If (x -y)^2= 200 and x^2 + y^2= 50 what Is the value of xy?

Respuesta :

AyaZ
AyaZ AyaZ
  • 13-04-2015
[tex] (x-y)^{2}= x^{2} -2xy+ y^{2} \\ xy= \frac{x^{2} +y^{2}-(x-y)^{2}}{2} = \frac{50-200}{2} = \frac{-150}{2} =-75[/tex]
Answer Link

Otras preguntas

If p(x) = x^2 – 1 and q(x)=5(x-1), which expression is equivalent to (p – q)(x)? 5(x – 1) – x^2 – 1 (5x – 1) – (x^2 – 1) (x^2 – 1) – 5(x – 1) (x^2 – 1) – 5x – 1
what times what is 30
How did native americans influence other parts of the world?
8+5.3=5.3+8 What property is it?
math help! -4 = 7(over) 33x x=132/7 x=-132/7 x= -7/132 x = -33/28 i think the answer is a but im not sure.
If an atom has 16 protons, 15 neutrons, and 19 electrons, what is the atom's electrical charge? a. -3 b. 1 c. -1 d. 3
what number can be written as 6 tens 2 ones
for your biology class, you have taken a number of measurements for A plant growth experiment. you wish to create a chart that shows what the progress looks lik
The height of the gateway
What is the setting at the end of "Younde Goes to Town"?