4 years ago

Solve the following quadratic equation: -x2 = 4x

Mathematics

1 answer:

Mashcka [7]4 years ago

4 0

Answer:

x=0 or x=-4

Step-by-step explanation:

0=x²+4x

0=x(x+4)

x=0 or x=-4

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Mr. Pham wrote the equation below on the board. 18 - 7x = -20.5 What is the value of x?

slavikrds [6]

Use the arithmetic operations to get the variable x on one side of the equation and everything else on the opposite side.

If something is being is being done to a variable, we undo that operation by using the inverse of that operation.

For example, if 10 is being added to x, we use the inverse of addition or subtraction.

18 - 7x = -20.5

We variable x is being multiplied by 7 and is subtracting 18. We need to undo all those operations.

18 - 7x = -20.5
-7x = -38.5

Now the variable is only being multiplied by -7. Reverse the operation.

-7x = -38.5
x = 5.5

So, x is equal to 5.5.

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Colt1911 [192]

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4 years ago

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What is the square footage of a ploygon that is 120 x 100?

viva [34]

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4 years ago

Find the greatest common divisor of 100 and 254, using • prime factorization- • euclidean algorithm-

larisa [96]

Via prime factorization:

$100=10^2=2^2\cdot5^2$
$254=2\cdot127$

of which the only common factor is a single power of 2, so $\mathrm{gcd}(100,254)=2$ .

Via the Euclidean algorithm:

$254=2\cdot100+54$
$100=1\cdot54+46$
$54=1\cdot46+8$
$46=5\cdot8+6$
$8=1\cdot6+2$
$6=3\cdot2+0$

which means $\mathrm{gcd}(100,254)=2$ , as expected.

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3 years ago