To complete the square: we take the coefficient ox "x" (which in this problem is -20) we divide it by 2 square that number then add it to both sides of the equation
-20 / 2 = -10 -10^2 = 100 then we add 100 to both sides of the equation: x^2 -20x x^2 -20x +100 = 100 ****************************************************** To get the roots of the equation, we take the square root of both sides: (x -10) * (x-10) = 10 (x-10) = square root (10) x-10 =
<span>
<span>
<span>
3.1622776602
</span>
</span>
</span>
x1 =
<span>
<span>
<span>
13.1622776602
</span>
and don't forget that square root of 10 also equals </span></span><span><span><span> -3.1622776602
</span>
</span>
</span>
x2 = 10
-<span>
<span>
<span>
3.1622776602 x2 = </span></span></span>
<span>
<span>
<span>
6.8377223398
</span>
</span>
</span>
<em>C. in five hours Caroline wraps an odd number of packages</em>
Step-by-step explanation:
<em>for</em><em> A until hours you would multiply 2 by 9 and 2 by 9 is 18 and that's an even number so it's not A.</em>
A eliminated.
for B in 3 hours 3 by 9 is 27 and that's an odd number so B is automatically eliminated.
<em>for C in 5 hours all you would do is multiply the 9 by 5 and 9 by 5 is 45 and 45 is indeed an odd number so C is your answer.</em>
<em>for D 7 by 9 is 63 and 63 is an odd number so we already know that C is the answer but still we got to check and D is wrong because 63 is not an even number.</em>
