X² + 10x +2 = 0 .Complete the square of (x² + 10x + ??)
We know that (10x) is equal to twice the square root of the 1st (x) by ??
10x = 2.x.(??) and ?? = 5 and its square is 25. Then I have to add 25 and subtract 25 so that not to change the equation:
(x² + 10x + 25) -25 +2 =0
(x+5)² -23
Answer:
321
Step-by-step explanation:
because 100+221 equals 321
Hope this helped.
I think it's another trick question and the answer is 2000.
25*8.14=?
Multiply the cost of the book per person ($8.14) by the number of people (25).
