Find the solution to the equation below?

Answer

A. x = 3/2

C. x = 1/2

Step by step explanation

The given equation 4x^2 - 8x + 3 = 0

Now we have to factorize the given expression.

Multiply "a" and "c"

Here the value of a = 4 and c = 3

ac = 4*3 = 12

Now we have to find the factors of 12 such that when we add them, we have to get -8.

The right factors are -6 and -2

Using the above factor, we can rewrite the given equation.

4x^2 - 8x + 3 = 0

4x^2 - 2x - 6x + 3 = 0

Now we can find the factors.

2x(2x - 1) - 3(2x - 1) = 0

(2x - 1) (2x - 3 ) = 0

Set the factors equal to zero and find the values of x.

2x -1 = 0             or (2x - 3) = 0

2x = 1                        2x = 3

x = 1/2                        x = 3/2

Therefore, the solutions are

x = 1/2 and x = 3/2

A) x = 3/2, C) x = 1/2

step-by-step explanation:

30% of $420 is 0.30($420) = $126 and $420 + $126 = $546.

or, 130% of $420 is 1.3($420) = $546.

notice that this is not the $600 original list price with which we started.

why doesn't this work?

the method does not work because 30% of $420 is not the same amount as the 30% of $600. it may seem obvious when stated this way, but it is a very common error made on problems of this type. we cannot just use the same percent and get back to the original amount because we are taking that percent of a different value.

to work problems of this type correctly, it is generally best to write an equation for the situation and then solve.

example: since (100% – 30%)(original price) = (sale price)

70% of the   (original price) is $420.

0.7x   = 420

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x = 600

the original cost was $600.

we may also solve this problem using the two-step method. working the problem in two steps requires us to use more algebra skills. we have to know that x = 1x (identity property of multiplicationtext annotation indicator) and that 1x – 0.3x = 0.7x (subtracting like terms). then we solve the problem as follows:

(original price) – 30%(original price) = sale price

x – 0.3x = 420

0.7x = $420

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x = 600

the original cost was $600.  

note that with both of the above methods we do obtain the correct original amount.

example: after a 5% pay raise, hermione is earning $22,680 per year. what was she earning before the pay raise?

105% of (original salary) = current salary

1.05x = 22,680

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x = 21,600

hermione earned $21,600 per year before the pay raise.

this is an example so maybe you will get how to at least do it!

linear pair postulates