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secondary 4 | A Maths
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Kathy
Kathy

secondary 4 chevron_right A Maths chevron_right Singapore

thank you

Date Posted: 7 months ago
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Eric Nicholas K
Eric Nicholas K's answer
3339 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
7 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
7 months ago
Thank you for helping