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Advocard [28]
4 years ago
13

Find the difference of 9x^2 + 5x - 6 and 2x^2 - 7x + 14 ​

Mathematics
1 answer:
NeTakaya4 years ago
3 0

Answer: 4

Step-by-step explanation: when finding the difference you're subtracting the 2 so 8-4=4 9x^2 + 5x - 6= 8

Factoring  9x2+5x-6  

The first term is,  9x2  its coefficient is  9 .

The middle term is,  +5x  its coefficient is  5 .

The last term, "the constant", is  -6  

Step-1 : Multiply the coefficient of the first term by the constant   9 • -6 = -54  

Step-2 : Find two factors of  -54  whose sum equals the coefficient of the middle term, which is   5 .

     -54    +    1    =    -53  

     -27    +    2    =    -25  

     -18    +    3    =    -15  

     -9    +    6    =    -3  

     -6    +    9    =    3  

     -3    +    18    =    15  

     -2    +    27    =    25  

     -1    +    54    =    53  

=8

2x^2 - 7x + 14 ​=4

actoring  2x2-7x+14  

The first term is,  2x2  its coefficient is  2 .

The middle term is,  -7x  its coefficient is  -7 .

The last term, "the constant", is  +14  

Step-1 : Multiply the coefficient of the first term by the constant   2 • 14 = 28  

Step-2 : Find two factors of  28  whose sum equals the coefficient of the middle term, which is   -7 .

=4

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That means, the youngest and the oldest add up to 46 years old.

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6 0
4 years ago
Read 2 more answers
15. Ankita bought 20 copy for Rs. 25 each. She got profit of Rs.200 while selling it. Find selling price of the copies. no​
goblinko [34]

Answer:

SP=Rs.700

Step-by-step explanation:

<em>cost</em><em> </em><em>price</em><em> </em><em>of a</em><em> </em><em>copy</em><em>=</em><em>R's</em><em>.</em><em>2</em><em>5</em>

<em>cost price of</em><em> </em><em>2</em><em>0</em><em>c</em><em>o</em><em>p</em><em>y</em><em>=</em><em>2</em><em>0</em><em>×</em><em>2</em><em>5</em><em>=</em><em>R</em><em>s</em><em>.</em><em>5</em><em>0</em><em>0</em>

<em>profit</em><em>=</em><em>Rs</em><em>.</em><em>2</em><em>0</em><em>0</em>

<em>selling</em><em> </em><em>price</em><em> </em><em>of</em><em> </em><em>2</em><em>0</em><em> </em><em>copies</em><em>=</em><em>?</em>

<em>Now</em><em>,</em><em> </em><em>we</em><em> </em><em>know</em><em> </em><em>that</em><em>,</em><em> </em>

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8 0
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masha68 [24]
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3 years ago
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