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GREYUIT [131]
3 years ago
14

9x-4=3x-28 step by step

Mathematics
1 answer:
kompoz [17]3 years ago
6 0

Answer:

Step-by-step explanation:

9x-4= 3x-28

We simplify the equation to the form, which is simple to understand  

9x-4=3x-28

We move all terms containing x to the left and all other terms to the right.  

+9x-3x=-28+4

We simplify left and right side of the equation.  

+6x=-24

We divide both sides of the equation by 6 to get x.  

x=-4

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Answer:

A.

Step-by-step explanation:

Take a look at what happens when squaring either of these...

(ax-by)^2=(ax-by)(ax-by)=a^2x^2-2abxy+b^2y^2\\\\(ax+by)^2=(ax+by)(ax+by)=a^2x^2+2abxy+b^2y^2\\

Notice a couple of patterns.

1.  The last term has a positive coefficient.  That rules out answer choices C and D.

2.  The coefficient of the middle term is either +2ab \text{ or } -2ab .  So what are <em>a</em>  and <em>b</em>?  <em>a</em> is the square root of the x^2 term and <em>b</em> is the square root of the y^2 term.

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The middle coefficient needs to be either +30 or -30.  The answer is choice A.

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