Question

If x square + y square is equal to 9 and x*y = 8 find the value of x+y
Answer:
±5
Step-by-step explanation:

Answer 1

Answer:

x² + y² = 9

xy = 8

now, (x + y)² = (x² + y²) + 2(xy)

⇒ (x + y)² = 9 + 2(8) = 9 + 16 = 25

=> x + y = ±5 (answer)

Answer 2

Answer:

Answer:

±5

Step-by-step explanation:

x² + y² = 9

xy = 8

now, (x + y)² = (x² + y²) + 2(xy)

⇒ (x + y)² = 9 + 2(8) = 9 + 16 = 25

=> x + y = ±5 (answer)