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zysi [14]
3 years ago
9

A student solved a quadratic equation as shown here:

Mathematics
1 answer:
djverab [1.8K]3 years ago
6 0

Answer:

x = 3/2 or x = -4

Step-by-step explanation:

The identifiable error the students have is that before the left hand side of the equation is factorized, the right hand side value of 12 ought to be brought to the left hand side, leaving a net value of zero on the right hand side. Then whatever is factored  on the left hand side is then equated to zero and then we can find the two values of x after setting each of the individual factors to zero

We proceed as follows;

2x^{2} + 5x = 12\\2x^{2} + 5x - 12 = 0\\2x^{2} + 8x -3x -12 = 0\\2x(x+4) -3(x+4) = 0\\(2x-3)(x+4) = 0\\2x-3 = 0 or x+4 =0\\2x=3 or x=-4\\x = 3/2 or x= -4\\x = 1.5 or- 4

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A watercolor painting is 24 inches long by 11 inches wide. Ramon makes a border around the watercolor painting by making a mat t
sergeinik [125]

Given: It is given that the length of the painting is 24 inches and the width is  11 inches.

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Solution:

The watercolor painting is 24 inches long by 11 inches wide.

So, the area of the painting is:

\text{Area of painting}=l\times b

\text{Area of painting}=24\times 11

\text{Area of painting}=264 \text{ in}^2

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Now to calculate the area of mat subtracts the area of painting from the area of the mat.

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6 0
2 years ago
What makes this statement true? 3+x/2= -4
Shtirlitz [24]

Answer:

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Step-by-step explanation:

3 + x/2 = -4

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3 years ago
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3 years ago
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Step-by-step explanation:

f(x) = 5x - 8

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= f( g(3) )

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= 5(-45) - 8

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= -233

(fog)(-3) = -233

3 0
2 years ago
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