(b/2)^2=(−5)^2
x^2−10x+(−5)^2=<span>24+<span>(−5)^<span>2
</span></span></span><span><span>x^2−10x+25</span>=49
</span><span><span>(x−5)^</span>2</span>=<span>49 (square root)
</span><span>(<span>x<span>−5</span></span>)</span>=<span>±<span>7
x-5=7 => x=12
x-5=-7 => x=-2</span></span>
Given that the elevator can only hold 4 people and that "people" could be either men "M" or woman "W", the possible combinations are as follows
WWWW = 0 men, 4 women = (0,4)
MWWW = 1 man, 3 women = (1,3)
MMWW = 2 men, 2 women = (2,2)
MMMW = 3 men, 1 woman = (3,1)
MMMM = 4 men, 0 woman = (4,0)
MKDORJRJDJRJFJJFDJFJKKKKKKKKKLKJEJEJJEJE
7.4x-9.2=2.6+5.2
Simplify
7.4x-9.2=7.9
add 9.2 to both sides
7.4x=17.1
divide both sides by 7.4
x=<span>2.31081081081 (about)</span>