Question

From the following, what must be added to 4x°-20x+20 to make it a whole
number?​

Answer 1

Step-by-step explanation:

4x^2+20x+16. (2x)^2 + 2 × 2x × 5 + 25 = (2x+5)^2. so ... 25-16 = 9. so 9 must be added to get a perfect square.! taffy927x2

Answer 2

\sum\limits_{i=1}^n x_i = x_1 + x_2 + \dots + x_n

i = index of summation

n = upper limit of summation