Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
secondary 4 | A Maths
One Answer Below
Anyone can contribute an answer, even non-tutors.
the answer is - 2<= x <0 and 3
(x - 5)(x + 2) ≤ 0
This is a U-shaped , upward sloping quadratic curve so for the y-value (or vertical axis value) to be ≤ 0, you should be looking at the portion of the curve between x = 5 and x = -2
The inequality should be :
-2 ≤ x ≤ 5
For your inequality on the left side, it should be x < 0 and not x > 0
x(x - 3) > 0
This is also a U-shaped , upward sloping quadratic curve.
So for the y-value (or vertical axis value) to be > 0, you should be looking at the portion of the curve between after x = 3 and before x = 0
The inequality should be :
x < 0 or x > 3
-2 ≤ x < 0
And
3 < x ≤ 5
Go to desmos.com and plot y = x² - 3x and y = x² - 3x - 10
See where the x-intercepts are. You'll understand better.
See 1 Answer