Math, asked by sunnyraj2769, 1 year ago

Ifxy=-30 and x^2+y^2=61 then find the value of (X+y)

Answers

Answered by princebaghi
0
 - 30^{2} + - 30 ^{2} = 61 \\ - 900 - 900 = 61 \\ value \: o \: x + y \: \\ - 1800 \\ please mark as brainlist.
Answered by shadowsabers03
0

Answer:

±1

Given:

  • xy = -30
  • x² + y² = 61

Step-by-step explanation:

  • Double 'xy = -30'

2xy = -60

  • Add both 'xy = -30' and 'x² + y² = 61'.

x² + y² + 2xy = 61 - 60

x² + y² + 2xy = 1

  • Factorise the LHS.

(x + y)² = 1

  • Take the square root of both sides.

x + y = ± 1

  • Thus the answer is +1 or -1.
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