If x - y = 4, x² + y² =10, then what is x + y?

Challenger App

★

1M+ Downloads

x - y = 4, x² + y² =10 ആയാൽ x + y എത്ര?

Answer:

(x + y)² + (x - y)² = x² + 2xy +y² + x² - 2xy + y² = 2(x² + y²) (x+ y)² = 2(x² + y²) - (x - y)² = 2 × 10 - 16 = 20 - 16 = 4 ( x + y) = 2

Related Questions:

If a- =1/a=3, then what is a³-1/a³ ?

Examine the nature of the roots of the following quadratic equation:

$3x^2+8x+4=0$