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Solve integral [3x^2 (x^3 + 1)^6] dx

Using the substitution u = x 3 +1 the answer can be found (x 3 +1) 7 /7 + C
KS
Answered by Kathryn S. • Maths tutor
8308 Views

Find the values of k for which the equation (2k-3)x^2 - kx + (k-1) = 0

A quadratic equation has two equal roots when its discriminant is equal to 0. Calculating the discriminant of the given equation: D = k 2 - 4(k-1)(2k-3) = k 2 - 8k 2 +20k-12 = -7k 2 +20k-12=0 Solving this eq...
KP
Answered by Katerina P. • Maths tutor
5123 Views

A curve C has the following equation: x^3 + 3y - 4(x^3)*(y^3) a) Show that (1,1) lies on C b) Find dy/dx

a) Substituting the coordinate (1,1) into the left hand side of the equation for C we obtain: (1 3 ) + 3*1 - 4(1 3 )(1 3 ) = 1 + 3 - 4 = 0 = The right hand side of the equation, hence the equation is satisfi...
HW
Answered by Harry W. • Maths tutor
3594 Views

show that tan(x)/sec2(x) = (1/2)sin(2x)

tan(x)/sec 2 (x) Sec(x) = 1/cos(x), therefore 1/sec(x) = cos(x). also tan(x) = sin(x)/cos(x).using substitution, tan(x)/sec 2 (x) = (sin(x)/cos(x)) * cos 2 (x) = sin(x)cos(x). sin(x+y) = sin(x)cos(y) + cos(x...
OO
Answered by Olaitan O. • Maths tutor
5377 Views

A ladder 5.5m long is leaning against a wall. the foot of the ladder is 1.7m away from the wall. how far up the wall does the ladder reach?

This is a classic GCSE Pythagoras' Theorem question. The first thing we are going to do is draw a diagram. Once we sketch out a diagram, we can see that the ladder makes a triangle shape with the wall. If we...
AN
Answered by Annie N. • Maths tutor
7685 Views