Question

7. Find the value of each of the following
expressions when x = -1, y = -2 and z = 2.
(a) -2x (3x - 4y) + 2y (6y - 92) + 2z (4z - x)
(b) 7 (x - y - z?) - 2 (z - x)​

Answer 1

sorry i dont know this answer

Answer 2

HERE IS UR ANSWER DEAR,

a) -2x (3x - 4y). + 2y (6y - 92) + 2z (4z - x)

= -2(-1) (3(-1) - 4(-2)) + 2(-2) (6(-2) - 92)

+ 2(2)(4(2) - (-1))

= 2(8-3) -4 (-92-12) + 4 (8+1)

= 2(5) - 4(-104) + 4(9)

= 10 + 416 + 36

= 456

b) 7 (x - y - z?) - 2 (z - x)

= 7 ((-1) - (-2) - (2)) - 2 ((2)- (-1))

= 7 (-1+2-2) -2(2+1)

= 7 (-1) - 2(3). = -7 -6 = -13