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Mathematics 13 Online
OpenStudy (trisarahtops):

Medal!! Question Below!!

OpenStudy (trisarahtops):

OpenStudy (trisarahtops):

can you see the attachment?

OpenStudy (trisarahtops):

@Data_LG2

OpenStudy (trisarahtops):

@freckles

OpenStudy (freckles):

hi

OpenStudy (trisarahtops):

Hi :)

OpenStudy (freckles):

\[\text{ Let } F(x)=\int\limits_{1}^{a(x)} g(t) dt \\ \text{ so assume } G'=g \\ \text{ anyways } F(x)=G(t)|_1^{a(x)}=G(a(x))-G(1) \\ \text{ for first term use chain rule } \\ \text{ second term use constant rule } \\ F'(x)=a'(x)G'(a(x))-0 \\ F'(x)=a'(x)g(a(x))\]

OpenStudy (freckles):

you can differentiate your integral in a similar way

OpenStudy (freckles):

notice your g(t) is sqrt(t^2+1) and your a(x) is 4x

OpenStudy (freckles):

a'(x)=?

OpenStudy (trisarahtops):

wait do you plug it into x?

OpenStudy (freckles):

I was currently just asking for a'(x) given a(x)=4x

OpenStudy (freckles):

\[F(x)=\int\limits_1^{4x} \sqrt{t^2+1} dt \\ F'(x)=a'(x)g(a(x)) \text{ where } g(t)=\sqrt{t^2+1} \text{ and } a(x)=4x\]

OpenStudy (freckles):

you will plug 4x into g(t)=sqrt(t^2+1) but you also need to differentiate (4x)

OpenStudy (trisarahtops):

8x^2+4x - 3/2

OpenStudy (freckles):

the derivative of 4x is 8x^2+4x-3/2? how did you get that?

OpenStudy (freckles):

Picture the line y=4x what is the slope of the line y=4x?

OpenStudy (trisarahtops):

the slope is 4

OpenStudy (freckles):

right the derivative of 4x is 4.. \[F(x)=\int\limits\limits_1^{4x} \sqrt{t^2+1} dt \\ F'(x)=a'(x)g(a(x)) \text{ where } g(t)=\sqrt{t^2+1} \text{ and } a(x)=4x \\ F'(x)=(4x)'g(4x)=4g(4x)\] last thing to do is replace the t in sqrt(t^2+1) with (4x)

OpenStudy (freckles):

\[F'(x)=4 \sqrt{(4t)^2+1}\]

OpenStudy (freckles):

oops that t is suppose to be x

OpenStudy (freckles):

but anyways i think you got it from here

OpenStudy (freckles):

if not i will be back after i eat

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