Differentiating some functions.

Hi guys, I have got some questions which i am unable to solve despite trying for so long. Would appreciate if someone would enlighten me :D:D

Differentiate the following:

1) y= a ²-x ² (My answer was 2a-2x but the given answer is -2x)

2)f(x)=x ²(4x-2) ( My answer was 24x ²-16x but given was 12x ²-4x)

3) x.√1+x²

Thank you in advance :D:D

Re: Some algebra question (Differentiation)

Quote:

Originally Posted by

**Lownavin** Hi guys, I have got some algebra question which i am unable to solve despite trying for so long. Would appreciate if someone would enlighten me :D:D

1) y= a ²-x ² (My answer was 2a-2x but the given answer is -2x)

2)f(x)=x ²(4x-2) ( My answer was 24x ²-16x but given was 12x ²-4x)

3) x.√1+x²

Thank you in advance :D:D

1. a is a constant.

2. Try expanding the function first.

3. Use the product and chain rules.