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Answer :

20+2(3y-4x)
=20+2(3(7)-4(3))
=20+2(21-12)
=20+2(9)
=20+18
=38

Given

x = 3, y = 7

To find out:

The value of 20 + 2(3y - 4x)

Solution:

  • 20 + 2(3y - 4x)

Let us put the value of x and y as given.

  • = 20 + 2 (3 × 7 - 4 × 3)

Now, solve the bracket portion. First do the multiplication.

  • = 20 + 2 (21 - 12)

Now, subtract.

  • = 20 + 2 (9)

Multiply 9 with 2.

  • = 20 + 18

Finally, add the two.

  • = 38

Answer:

38

Hope you could understand.

If you have any query, feel free to ask.

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