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Using the grid method, we know this is equal to (10100) + (1020) + (7100) + (720) = 1000+200+700+140 = 2040
1/(x2) can be written as x-2
We know that to differentiate you need to multiply by the value of the old power and minus 1 from it. This means dy/dx of y=...
If a number is to the power of 2/3, you should think of it as to the power of 1/3 (so CUBE-rooted), and then being to the power of 2 (so squared).
So here, the cube root of 64 is 4, because 4x4x4=6...
The easy way to remember these uses the acronym SOH-CAH-TOA
The function to use depends on the sides of the triangle you know in the problem.
With right angled triangles each side has a nam...
Put w=a+bi, z=c+di where a, b, c, d are real, and i2=-1. Then |wz|2=|(a+bi)(c+di)|2=|ac-bd+(ad+cb)i|2=(ac)2+(bd)2-2bcd+(ad)2+(c...
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