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svlad2 [7]
3 years ago
10

How do I make both these equations into a elimination equation? Look at the pic I’m very confused!

Mathematics
1 answer:
qwelly [4]3 years ago
6 0

Answer:

Step-by-step explanation:

c + a = 342 ..................... <em>(1)</em>

5c + 12a = 2550 ........... <em>(2)</em>

- 5 × <em>(1)</em> + <em>(2)</em>

7a = 840

<em>a = 120</em>

<em>c</em> = 342 - 120 <em>= 222</em>

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Select all the correct answers. the square of a number is 3 less than four times the number. which values could be the number?
Nimfa-mama [501]

The given expression "the square of a number is 3 less than four times the number" is represented as x² = 3 - 4x and the values of number could be: x1= 0.645 , x2= -4.645

In mathematics, when we refer "square of a number" we mean that the exponent of that number is 2. So we express it mathematically as:

x²

When we express "3 less than" of a number we mean that the number 3 is subtracting that number. So we express it mathematically as: 3 -

x² = 3 -

When we express "four times the number" we mean that the number is exactly 4 times greater than a number or that it contains it 4 times. So we express it mathematically as: 4x

x² = 3 - 4x

Organizing the values, we have a quadratic equation: x² + 4x – 3 = 0

Where:

  • a=  1
  • b= 4
  • c= -3

Solving the quadratic question we get the values for the (x) number

x= {- b ± √ [b² - (4* a*c)]} / (2 *a)

x= {- 4 ± √ [4² - (4* 1*-3)]} / (2 * 1)

x= {- 4 ± √ (16 + 12)} / 2

x= {- 4± √ 28} / 2

x= (- 4 ± 5.29 ) / 2

x1= (- 4 + 5.29 ) / 2

x1= (1,29) / 2

x1= 0.645

x2= (- 4 - 5.29 ) / 2

x2= (9.29) / 2

x2= -4.645

We can check the values, replacing them into the equation:

(x1)² = 3 - 4(x1)

(0.645)² = 3 - 4*(0.645)

0.42 = 0.42

(x2)² = 3 - 4(x2)

(-4.645)² = 3 - 4*(-4.645)

21.58 = 21.58

<h3>What is a quadratic equation?</h3>

It is an algebraic equation where the polynomial formed has three terms, one variable has an exponent 2, another in which the variable has exponent 1 and the last term without any variable. Its standard form is:

ax²+ bx + c = 0

Learn more about quadratic equation at: brainly.com/question/25841119 and brainly.com/question/7784687

#SPJ4

3 0
1 year ago
Which is the factored form of 2x(4x + 3) - (4x + 3)?
STALIN [3.7K]

Answer: The answer would be D.

Step-by-step explanation: (4x+3)(2x−1)

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3 years ago
A football field measures 300 feet in length. It can also be expressed as approximately 5 7x 10miles. If the
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Answer:

The question is incomplete or there are details missing.

Step-by-step explanation:

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The conversion factor between ft and metre is 1ft = 0.3048m

As such, we can only have variations or the length of the field measured may have ranges of measurement,  but as it is the length of the field can not be expressed in terms of miles, the most reasonable vale of n we can get will be the least measurement in metres.

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Help with #10 plz...
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A. is 21.98 cm
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What is 4w to the power of -3 divided by 3 to the power of -2+ w to the power of 7 + x to the power of -2
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Answer:

idk this stuff yet

Step-by-step explanation:

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