2 years ago

O How can you explain, without just using a rule, why 4.2 = 0.2 is the same as 42 = 2? I

Mathematics

1 answer:

Softa [21]2 years ago

6 0

Ratio-wise it is the same :)

They're just moving decimals

.42 : .02

4.2 : .2

42 : 2

420 : 20

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The number is twelve.

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Step-by-step explanation:

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long way:

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1 year ago

Rewrite the equation by completing the square. 4x^2 + 28x + 49=0

Evgen [1.6K]

Answer:

$4(x+3.5)^{2}=0$

Step-by-step explanation:

we have

$4x^{2}+28x+49=0$

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Group terms that contain the same variable, and move the constant to the opposite side of the equation

$(4x^{2}+28x)=-49$

step 2

Factor the leading coefficient

$4(x^{2}+7x)=-49$

step 3

Complete the square. Remember to balance the equation by adding the same constants to each side

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step 4

Rewrite as perfect squares

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2 years ago