Question

If y²-x=7, find the positive value of when x=9.​

Answer 1

y = + 4

Explanation:

y² - x = 7 ← substitute x = 9 into the equation

y² - 9 = 7 ( add 9 to both sides )

y² = 16 ( take square root of both sides )

y = ±
`√(16)` = ± 4

the positive value of y when x = 9 is + 4

Answer 2

4

Explanation:

when x = 9:

⇒ y² - 9 = 7

⇒ y² = 7 + 9

⇒ y² = 16

⇒ y = √16

⇒ y = ±4

Therefore, the positive value of y = 4