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kodGreya [7K]
3 years ago
11

Please helpppp!!! Solve: x^2 - 4x-5=0

Mathematics
1 answer:
PtichkaEL [24]3 years ago
4 0

Answer:

x=-1,5

Step-by-step explanation:

x^2-4x-5=0

In order to solve this quadratic, we have many methods. We can factor, complete the square, or use the quadratic formula. I'm going to factor since it's the easiest method.

To factor, find two numbers that when multiplied equal a(c) and when added equal b.

a=1, b=-4, and c=-5.

So we want two numbers that when multiplied equals 1(-5)=-5 and when added equals -4.

-5 and 1 are the possible numbers. Therefore:

x^2-4x-5=0\\x^2+x-5x-5=0\\x(x+1)-5(x+1)=0\\(x-5)(x+1)=0\\x=5, -1

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A box is to be constructed from a sheet of cardboard that is 10 cm by 60 cm by cutting out squares of length x by x from each co
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Volume of a rectangular box = length x width x height<span>

From the problem statement,
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<span>
where x is the height of the box or the side of the equal squares from each corner and turning up the sides

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To maximize the volume, we differentiate the expression of the volume and equate it to zero.

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</span><span>
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