Top answers

Why is 2 + 2 not equal to 12?

This might seem like an obvious question and the instinctive urge is to disregard it entirely. Perhaps you would think "well that's silly, it's just not!" Well, that's the intention of the question...
XJ
Answered by Xav J. • Maths tutor
5009 Views

integrate e^x sin x dx

1/2 e x (sin x -cos x)
SJ
Answered by Sam J. • Maths tutor
4982 Views

Derive the quadratic formula (Hint: complete the square)

Firstly, the quadratic formula finds the roots of a quadratic equation. So this means f(x) = 0. A general polynomial with highest power 2 looks like: ax 2 + bx +c. Usings the two facts we just stated, we sol...
RK
Answered by Riu K. • Maths tutor
4213 Views

How do I differentiate something of the form a^x?

You should write a x as (e lna ) x = e xlna . ln(a) is a constant, so use the chain rule to differentiate this: lna(e xlna ) = lna(a x )
IS
Answered by Ilya S. • Maths tutor
4973 Views

Find the cross product of vectors a and b ( a x b ) where a = 3i + 6j + 4k and b = 6i - 2j + 0k.

a x b = 8i + 24j - 42k
ID
Answered by Isaac D. • Maths tutor
4544 Views