Question

If x=2, y=1,z= -1, then simplify and find the value of3x-[4y-{5z-(7x-2y+6z)}]

Answer 1

Given: x = 2, y = 1 and z = -1.

To find: The value of 3x - [4y - {5z - (7x - 2y + 6z)}].

Answer:

Let us substitute the given values in the equation.

3*2 -  [4*1 - {5*(-1) - (7*2 - 2*1 + 6*(-1))}]

Let us simplify the innermost bracket.

3*2 -  [4*1 - {5*(-1) - 14 + 2 + 6}]

Now the middle bracket.

3*2 - [4*1 + 5 + 6]

Now the outermost bracket.

3*2 - (4 + 5 + 6)

6 - 15

= -9

Hope it helps :)