Ong Cho Sin's answer to Anonymous's Secondary 3 E Maths Singapore question.
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Learn to spot mistakes and it will save a lot of unnecessary time.
When you find answer a bit odd, check first!
When you find answer a bit odd, check first!
Date Posted:
3 years ago
Ok thanks
The “x + 7” was probably meant to be bracketed, such that his working becomes
(x + 7) (x - 2) + ...
(x + 7) (x - 2) + ...
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