AC Lim's answer to Amanda's Secondary 2 Maths Singapore question.
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Hope this helps
Date Posted:
2 years ago
may i ask whats the r+ 5 for? Thanks!
hi! thanks! whats the r + 5 for last equation?
-2r-10
-2r -2(5)
-2(r+5)
-2r -2(5)
-2(r+5)
Actually,
Can stop at
-2r-10/(r+2)(r-1)
Can stop at
-2r-10/(r+2)(r-1)
ok! thank you so much!
i have one more question! the question is expand and simplify this qns (x-4)(7-2x).
My answer on the end is -2x2 + 15x - 28! Do I have to use the multiplication table? If not I’ll get
(2x-7)(x-4)
My answer on the end is -2x2 + 15x - 28! Do I have to use the multiplication table? If not I’ll get
(2x-7)(x-4)
Should be -2x²+15x-28
Or
-(2x²-15x+28)
Or
-(2x²-15x+28)
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