See Arnold K H Tan's answer to Anonymous's Secondary 4 A Maths Singapore question

Arnold K H Tan's answer to Anonymous's Secondary 4 A Maths Singapore question.

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Author of several O-level Science guide books (my profile pic). My forte is tutoring O-level sciences (Chemistry, Physics, Biology). Telegram Messenger: @ChillXsg note that only my tuition students have the privelege to direct message questions, to clarify.

Date Posted: 3 years ago

Comments 4 add a comment

Anonymous

3 years ago

for part a what happens to the +4 when u differentiate it?

Arnold K H Tan

3 years ago

Coefficients disappear when you diffrententiate them

Anonymous

3 years ago

ohh ok thanks

Eric Nicholas K

3 years ago

Actually a constant term rather than a coefficient, since the +4 does not come with any x attached.

To the OP, when a constant term gets differentiated, it becomes zero and effectively vanishes. The power of x in a constant term is counted as zero (here’s it’s 4 multiplied by x^0). When we differentiate, the “0” is moved down from the power, and this “0” will cause the entire expression 0 multiplied by 4 multiplied by x^(-1) to become zero.