Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
secondary 2 | Maths
One Answer Below
Anyone can contribute an answer, even non-tutors.
Not sure how to do this
lol
y² = 3 or y² = 1
.
.
.
now notice that y⁴ = (y²)²
So
(y²)² - 4(y²) + 3 = 0
It is actually now in the form of a quadratic equation. You can use a substitution like u = y² if you find it difficult to visualise.
Then,
(y² - 1)(y² - 3) = 0
y² - 1 = 0 or y² - 3 = 0
y² = 1 or y² = 3
y = ± 1 or y = ± 3 (rejected as y is integer)
So y = 1 or y = -1
See 1 Answer