Eric Nicholas K's answer to Kathy's Secondary 4 A Maths Singapore question.

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Eric Nicholas K
Eric Nicholas K's answer
3856 answers (Tutor Details)
1st
The approach is to substitute a rearranged form of an equation into the same equation.
Eric Nicholas K
Eric Nicholas K
9 months ago
For the first question I let a = (2a2 + 7) / 3. I then replace one a (from the 2a2) from the original equation with the substituted form for part (i) and then replace both a (from the 2a2) from the original equation with the substituted form.

The other question is very similar. Since the final form does not have a term in a, I replace the unwanted a with the substituted form.
Kathy
Kathy
9 months ago
Thank you for helping