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Nataly [62]
2 years ago
10

Hey i know this question is linked to Pythagorean theorem but i am still confused. So, please help me if you can ❤️

Mathematics
2 answers:
qwelly [4]2 years ago
7 0

Answer:

a = -10, b = 18

Step-by-step explanation:

The Pythagorean Theorem is, indeed, involved.  Use it to find an expression (you won't get a number!) for the height of the rectangle.

Using the right triangle, one leg has length  x  and hypotenuse length 8.  for a moment, label the height  h.  Then

x^2+h^2=8^3\\\\h^2=64-x^2\\\\h=\sqrt{64-x^2}

This expression tells the height of the rectangle, so it is the length of the two vertical sides.  The top and bottom sides each have length x.

Perimeter = 20 says that the total length of all the sides is 20.  Set that up and do a heap of algebra!

x+x+\sqrt{64-x^2}+\sqrt{64-x^2}=20\\\\2x+2\sqrt{64-x^2}=20

Divide by 2 (to simplify a bit).

x +\sqrt{64-x^2}=10

Subtract x to get the square root by itself (you'll see why in the next step).

\sqrt{64-x^2}=10-x

Square both sides of the equation.

(\sqrt{64-x^2})^2=(10-x)^2\\\\\\64-x^2=100-20x+x^2\\\\64=100-20x+2x^2\\\\0=36-20x+2x^2

Divide by 2 again (because you can)

0=18-10x+x^2

Rearrange terms to match the order in the question.

x^2-10x+18=0

The coefficient of  x  is  a = -10.  The constant is  b = 18.

antiseptic1488 [7]2 years ago
6 0

Step-by-step explanation:

From Pythagorean theorem, one of the sides can be determined as x^2 + y^2 =8^2

or y = (8^2 - x^2)^(1/2)

we can write the perimeter P as

P = 2x + 2y ---> 20 = 2x + 2(8^2 - x^2)^(1/2)

Dividing by 2, we get

10 = x + (8^2 - x^2)^(1/2)

Move the x to the other side,

10 - x = (8^2 - x^2)^(1/2)

Take the square of both sides to get rid of the radical sign:

(10 - x)^2 = 8^2 - x^2

Move everything to the left and expand the quantity inside the parenthesis:

x^2 + (100 - 20x + x^2) - 64 = 0

2x^2 - 20x + 64 = 0

or

x^2 - 10x + 32 = 0

Now we can see that a = -10 and b = 32

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