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astra-53 [7]
3 years ago
11

Plsss help meeeee 7^-8 divided by 7^-11

Mathematics
2 answers:
Andrej [43]3 years ago
4 0

Answer:

i think the answer is 7^3

Step-by-step explanation:

when dividing numbers with exponents, you just subtract the smaller exponent from the larger one

pls tell me if im wrong

jarptica [38.1K]3 years ago
4 0

Answer:

343

Step-by-step explanation:

7^-8/ 7^-11

7^ -8 - (-11)

7^3

Which equals 343

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OK.  These problems are easy if you know the quadratic formula,
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Here's the quadratic formula:

When the equation is in the form of      Ax² + Bx + C = 0

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The first question says        3x²  +  5x  +  2  = 0

Is this in the form of             Ax²  +  Bx  +  C  = 0    ?

             Yes !                    A=3      B=5   C=2

             so you can use the quadratic formula to solve it.

            x =  [ -B plus or minus √(B²-4AC) ] / 2A

               =  [ -5 plus or minus √(5² - 4·3·2) ] / 2·3

               =  [ -5 plus or minus √(25 - 24)  ]  /  6

               =  [  -5 plus or minus  √1          ]  /  6

           x  =        -4 / 6  =  -2/3
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           x  =        -6 / 6  =  -1 .    
_______________________________________

The second question says

                                         4x²  +  5x  -  1 = 0

Is this in the form of          Ax²  +  Bx + C = 0  ?

           Yes it is !            A=4     B=5   C= -1  

         so you can use the quadratic formula to solve it.

            x =  [ -B plus or minus √(B²-4AC) ] / 2A

Now, you take it from here.

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