Perform the indicated operation. 4/7x^2 - 3/2x^3

LCM of both 7,2 is 14

mutiply by 2 4/7x^2*2x/2x=8x/14x^3

3/2x^3*(7/7)=21/14x^3

8x/14^3-21/14x^3

explanation:

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8 - (2a + 7) = a + 40     distribute/multiply - into (2a + 7)

8 - 2a - 7 = a + 40

1 - 2a = a + 40       add 2a on both sides

1 = 3a + 40         subtract 40 on both sides

-39 = 3a       divide 3 on both sides

-13 = a

[proof]

8 - (2a + 7) = a + 40

8 - (2(-13) + 7) = -13 + 40

8 - (-26 + 7) = 27

8 - (-19) = 27

8 + 19 = 27

27 = 27