2 years ago

(9x^4-3x^3+4x^2+5x+7) + (11x^4-4x^2-11x-9)

Mathematics

1 answer:

icang [17]2 years ago

5 0

Answer:

20x^4 - 3x^3 - 6x - 2

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Answer:

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Step-by-step explanation:

Let

x ----> the original length of the piece of metal

y ----> the original width of the piece of metal

we know that

When squares with sides 5 in long are cut from the four corners and the flaps are folded upward to form an open box

The dimensions of the box are

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Remember that

The piece of metal is 25 in longer than it is wide

$x=y+25$ ----> equation B

substitute equation B in equation A

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Solve the quadratic equation by graphing

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see the attached figure

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