Thread: tangent equation

hi, my question is: find and equation of the tangent to the following curve at the point where x = 0



first i differentiated so i could find the gradient: then subbing x = 0 into the equation you get 5 for the gradient.
using x = 0 you can also see that from the original equation y = -2

then using the equation formula i got so the equation looks to me like it should be y = -2

the answer in the back gives for the equation

can someone show me what i'm doing wrong please,
thankyou

ps what do you have to type into latex to get the 1's in to appear small and at the bottom of the x and y if you know what i mean? like the same size as "to the power of" but at the bottom

Originally Posted by mark

hi, my question is: find and equation of the tangent to the following curve at the point where x = 0



first i differentiated so i could find the gradient: then subbing x = 0 into the equation you get 5 for the gradient.
using x = 0 you can also see that from the original equation y = -2

then using the equation formula i got so the equation looks to me like it should be y = -2

the answer in the back gives for the equation

can someone show me what i'm doing wrong please,
thankyou

ps what do you have to type into latex to get the 1's in to appear small and at the bottom of the x and y if you know what i mean? like the same size as "to the power of" but at the bottom

How does imply ...? Check your algebra!

To make it appear as you want, use the underscore symbol. For example: x_1, y_1, z_1 yields: . If you want more than one character there, wrap them in {} symbols, ie: z_{abc} gives: .

yeah i can't believe i made that mistake, how stupid. thanks for the help