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SSSSS [86.1K]
3 years ago
15

A cereal box has a volume of 441 cubic inches. Its height is 12 inches, its width is x inches, and its length is (x+7) inches. W

hat is the width of the box?
Mathematics
1 answer:
likoan [24]3 years ago
7 0
Volume = length * width * height 
<span>441 = (x+7) * x * 12 </span>
<span>All you have to do is just find x which is the width. </span>

<span>441 = (x+7) * 12x </span>
<span>441 = 12x2 + 84x </span>
<span>12x2 + 84x - 441 = 0 </span>

<span>Thus you have a quadratic equation with two possible solution. Use the quadratic formula To calculate the x values. If you calculate it, you will find that x = 3.5 and x = -10.5. To prove which one is the width, substitute these values for x one at a time into the volume equation. Lets take x=3.5 </span>

<span>441 = (x+7)+x+12 </span>
<span>441 = (3.5+7) *3.5*12 </span>
<span>441 = 10.5*3.5*12 </span>
<span>441= 441 </span>

<span>If we try -10.5; </span>

<span>441 = (x+7) *x*12 </span>
<span>441=(-10.5+7)*10.5*12 </span>
<span>441 = -3.5*10.5*12 </span>
<span>441 = -441 </span>

<span>Therefore clearly, our answer will be x = 3.5... We don't have to use the substitution to prove our answer is 3.5 because logically we can rule out -10.5 inches of width. Realistically, there can never be a negative width. Therefore your width is 3.5 inches. Hopefully this helps!</span>
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