6z-4z-z = 6-7-4 z = -5
(z=-3) and (z=7)
(z - 9)(z + 5)
3y + 4z + 12y = 3y -3y -3y ------------------------- 4z + 12y = 0 divide everything by 4 z + 3y = 0 -3y -3y z = -3y
5x-2y+3z-2x-y-4z=3x-3y-z
9z
6z-4z-z = 6-7-4 z = -5
4z-11=45 4z=56 z=14
7 + 4z = 437 + 4z -7 = 43 - 7 4z = 43 - 7 4z = 36 z = 9
If the question is x + 4z - 5 - 3x when x = 2 and z = 3x, then First simplify the original statement x + 4z - 5 - 3x = 4z - 5 - 2x Secondly substitute in 3x for z 4z - 5 - 2x = 4*3x - 5 - 2x = 12x - 5 - 2x = 10x - 5 Lastly substitute 2 for the x 10x - 5 = 10*2 - 5 = 20 - 5 = 15 or x + 4z - 5 - 3x when x = 2 and z = 3x, so z = 3*2 = 6 x + 4z - 5 - 3x = 4z - 5 - 2x (replace the variables with the corresponding values) = 4*6 - 5 - 2*2 = 24 - 5 - 4 = 24 - 9 = 15
(z=-3) and (z=7)
4z - 1 = 9 4z = 10 (add 1 to both sides) z = 2.5 (divide both sides by 4)
4z means to multiply a number with another number.
(z - 9)(z + 5)
3y + 4z + 12y = 3y -3y -3y ------------------------- 4z + 12y = 0 divide everything by 4 z + 3y = 0 -3y -3y z = -3y
The answer to (z + 1)(z - 5) is z2 -4z - 5. You can find this answer by using the FOIL method. Take the First (z and z) of each and multiply them together. This will give you z2. Multiply the Outer (z and -5) and Inner (z and +1), then add the two numbers together. This will give you -4z. Finally, multiply the Last(+1 and -5) of each factor. This will give the final answer of z2 - 4z - 5.
That depends entirely on what the value of z is.