See Nathaniel's answer to Kkk's Secondary 2 Maths Singapore question

Nathaniel's answer to Kkk's Secondary 2 Maths Singapore question.

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Using the quad formula which is x=-b there line u see, complete b . Both same formula
How i get 4p-3 from 3/4
(P-3/4)(p+3) is same as (4p-3)(p+3)

And 4/9p^2 + p - 1 = 4p^2 +9p -9 (9 is multiplied)

Date Posted: 4 years ago

Comments 4 add a comment

Matthew Soon

4 years ago

The question is asking for factorization of the expression though, not solving for the variable.

Nathaniel

4 years ago

But u can use that way to factorise too . I gave the factorised ans

Matthew Soon

4 years ago

Technically true, although 2 points:

1. Answer missed out the (1/9) constant

2. They may not award method marks since the question requested for factorized expressions (i.e. there's no equal sign to begin with, there shouldn't be a reason to include equations as part of the answer).

I don't disagree that the method works; it can, just not what the question was asking for?

Mr Ang

4 years ago

Pardon me Mr Joel, you are helping a Sec 2 student, and Sec 2 syllabus does not cover Quadratic Formula. Therefore, your method would not be acceptable.

Second point - your factorised form, when expanded, will not give the original expression as what Mr Soon had mentioned. Kindly take note eh, thanks.