Question

5. Simplify the following expression and "find its value when x = 1, y = -2 and z = 3: 6z– 5yz – [9xły - (-4xy + 3z²y) - 4xy – 5yz + 2]​

Answer 1

Given:

x = 1

y = -2

z = 3

To solve:

$6z - 5yz - [9xy -(-4xy + 3z^2y) - 4xy - 5yz + 2]$

Substituting all the values

$6(1) - 5(-2)(3) - [9(1)(-2) -(-4(1)(-2) + 3(3^2)(-2)) - 4(1)(-2) - 5(-2)(3) + 2]$

$6 -30 - [-18 - (8 +27) +8 -30 + 2]$

$-24 -[-18 -35 +8 - 30 + 2]$

$-24 - [73]$

$-24 + 73$

= 49

I'm honestly not sure if this is correct, the questions literally WILD