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mrs_skeptik [129]
3 years ago
14

Help pls 6th grade math i will give brainliest

Mathematics
1 answer:
k0ka [10]3 years ago
6 0

Answer:

4th one

Step-by-step explanation:

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What are the solutions to the equation 2x^2 + 9x =5
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Answer:

\displaystyle -5 \ and \ \frac{1}{2}

Step-by-step explanation:

2x^2 + 9x =5

we have to move 5 in the other side with a different sign, to get a 2 grade ecuation

2x^2 + 9x -5= 0

now we know

a=2

b=9

c=-5

we have to find delta

\boxed{\Delta=b^2-4ac} \\\\ \Delta=9^2-4\cdot2\cdot(-5)\\ \Delta=81+40 \\ \Delta=121

and now we have to use the formula to find the root square

\displaystyle \boxed{ X_{1,2}=\frac{-b\pm\sqrt{\Delta} }{2a} }

\displaystyle X_1=\frac{-b-\sqrt{\Delta} }{2a} =\frac{-9-11}{2\cdot2}=\frac{-20}{4}  =-5

\displaystyle X_2=\frac{-b+\sqrt{\Delta} }{2a} =\frac{-9+\sqrt{121} }{2\cdot4} =\frac{-9+11}{4} =\frac{2}{4} =\frac{1}{2}

8 0
3 years ago
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. Evaluate the following: |15 - 47] + 9 - (-2)(-4) - 17|
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Answer:

48

Step-by-step explanation:

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Answer:

I believe it is 54/99

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