AC Lim's answer to Keiko's Secondary 2 Maths Singapore question.
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This is correct working. Hope this helps
Date Posted:
1 year ago
Hello , I also need help with the part of saying what is the person wrong … u only do one part
Q1. concept or working to find value k is wrong, when 4 = k √200
4= k(20)
k = 4/20
k = 1/5
4= k(20)
k = 4/20
k = 1/5
Q2 Wrong concept or approach.
1 1/5 = 5√(q-2) is not same as
2 = √(q-2).
When left hand side ÷ 5, right hand side must ÷5 for equation.
1 1/5 ÷5 = 5÷5 √(q-2)
6/25 = √(q-2)
Here another mistake, to get rid of √
We can ² both side
(6/25)² = (√(q-2)²
36/625 = q-2
1 1/5 = 5√(q-2) is not same as
2 = √(q-2).
When left hand side ÷ 5, right hand side must ÷5 for equation.
1 1/5 ÷5 = 5÷5 √(q-2)
6/25 = √(q-2)
Here another mistake, to get rid of √
We can ² both side
(6/25)² = (√(q-2)²
36/625 = q-2
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