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Nimfa-mama [501]
3 years ago
8

A classroom's length is 3m less than two times its width. The classroom has a length of 9m. Solve an equation to determine the w

idth of the classroom.
Mathematics
1 answer:
Ugo [173]3 years ago
8 0
The equation would be 2w-3=9. Do the inverse operation for '3' on both sides of the equation. Then do the inverse operation on both sides of the equation for '2w'.
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pochemuha
To get the vertex of the parabola we proceed as follows;
y=-7(x-4)^2-5
The above can be written as:
y=-7x^2+56x-117
The values of a,b and c are:
a=-7, b=56 and c=-117
x=-b/(2a)
x=-56/(-7*2)=4
but;
y=-7x^2+56x-117
y=-7(4)^2+56(4)-117
y=-5
Thus;
x=4 and y=-5
The vertex will be at point (4,-5)


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