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Mathematics

2 answers:

4vir4ik [10]3 years ago

7 0

Answer:

x = 13

Step-by-step explanation:

Combine like terms:

3/5x (x + 2 ) = x - 4

3/5x + 6/5 = x - 4

-x -x

-2/5x + 6/5 = -4

- 6/5 -6/5

-2/5x = -26/5

divide everything by -2/5

Your final answer should be 13.

You can double-check by substituting 13 into the original equations.

Nookie1986 [14]3 years ago

3 0

Answer:

2 is the right answer

Step-by-step explanation:

3/5(x + 2) = x - 4

3/5x + 1 1/5 = x - 4

-3/5 x -3/5x

1 1/5 = 2/5x - 4

+4 +4

5 1/5 = 2/5x

÷2/5x ÷2/5x

13 = x

Hope this helped! :D

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3 years ago

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3 years ago

Read 2 more answers

98-x2=0 solve this with the quadratic formula

Mars2501 [29]

Answer:

x∈{-7√2, 7√2}

Step-by-step explanation:

$98-x^2=0\\\\-x^2+98=0\\\\a=-1\,,\ \ b=0\,,\ \ c=98\\\\x_1=\dfrac{-0-\sqrt{0^2-4\cdot(-1)\cdot98}}{2\cdot(-1)}=\dfrac{-\sqrt{4\cdot49\cdot2}}{-2}=\dfrac{-2\cdot7\sqrt{2}}{-2}=7\sqrt2\\\\x_2=\dfrac{-0+\sqrt{0^2-4\cdot(-1)\cdot98}}{2\cdot(-1)}=\dfrac{2\cdot7\sqrt{2}}{-2}=-7\sqrt2$