Recent content by Danatron

ok good, so i wouldn't go again until there were no powers? eg. f ' (x) = 2(3x) - 2(2x) + 1

can i use the power rule to get the derivative here? f ' (x) = 3x^2 - 2(2x^1) + 1

x < -5 & x > 1

so that would be everything before -5 and everything after 1 right?

Hi Guys, I am revising for an exam i have this week, the last module on my subject was calculus. I did not understand it entirely. I have posted a pic below of a typical problem i can expect to encounter, would anybody be able to point me in the right direction to study material that...

quadratic ok so i have graphed the quadratic and circled in red all the positive values of x, how would i write this? http://i.imgur.com/WwvsteW.jpg?1

Question 1 (a) Solve the quadratic equation x^2 + 4x -5 = 0 (b) Factorise its left hand side. (c) Find interval(s) of x where the left hand side is positive Q1 (a) (x+-1) (x+5) x= 1 x=-5 is that solving the equation? (b) didnt i already factorise the left hand side...

Hi Guys, Im working on finding an angle between two vectors. a [ 1,2,3 ] b [ 4, -1, 0] //a// = sqrt(1^2+2^2+3^2) = sqrt14 //b// = sqrt(4^2+(-1)^2+0^2 = sqrt17 Dot product 1.4 + 2.-1 + 3.0 = 2 cos^-1 2/ sqrt14 sqrt17 cos^-1 (1/( ? ) Thanks

Do you know where i could do some reading to find out where to begin with this problem?

The car has a velocity of 100km/h and slows down to 10km/h? The 50 was just a random distance number. Disregard it.

A Car, initially traveling at the speed 100 km/h, slows down according to the formula. L(t)= At - Bt^2 Where L is the traveled distance, t is the time & B= 90 km/h^2. Using derivative, find the time moment when the car speed becomes 10 km/h. Find the acceleration of the car at this moment. i...

http://imgur.com/uhBJ0Iv

wouldn't it be to or facing the upstream direction?

from the rear end of the barge?

ok, i think i have it, 78deg?