Explain complete square formula with graphic area Go to your space and draw. I'll see What I want is a graph of (a-b) ^ 2

Explain complete square formula with graphic area Go to your space and draw. I'll see What I want is a graph of (a-b) ^ 2

same
A square with a side length of a has a side length of B at the bottom left, a side length of A-B at the top right, and the rest are two rectangles with a length of a and B width. Then the area with a side length of A-B is equal to the area of the large square plus the area with B side length minus the area of the two rectangles

The first n terms and Sn of the sequence 1 / 2,1 / 2 + 3,1 / 2 + 3 + 4,..., 1 / 2 + 3 + 4 +... + (K + 1)=
The final answer is 11 / 9-2 / 3 (1 / N + 1 + 1 / N + 2 + 1 / N + 3)

Next time, let's make it clear. If you do this, it will lead to divergence. Let's set AK = 1 / [2 + 3 + 4 +(K + 1)] = 2 / (k ^ 2 + 3) = (2 / 3) [(1 / k) - (1 / (K + 3))] this requires the split term summation method. AK = two-thirds times [K / 1 minus (K + 3)], so Sn = (2 / 3) (1 - (1 / 4) + (1 / 2) - (1

The sum of the first n terms of a sequence is Sn = 3 * 2 ^ n + K. if it is an equal ratio sequence, find K

sn-1=3*2^n-1 +k
an=sn-sn-1
=3*2^n +k-3*2^n-1 -k
=3*2^n-3*2^n-1
=3*2*2^n-1 -3*2^n-1
=3*2^n-1(2-1)
=3*2^n-1
a1=3*2^0=3
a1=s1=3*2+k=6+k
3=6+k
k=-3