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Q: Z squared equals 4z plus 21?

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-8z + 12 = 12 - 4z-8z +4z + 12 = 12 - 4z +4z-4z + 12 -12 = 12 -12-4z / -4 = 0 / -4z = 0:)

6z-4z-z = 6-7-4 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

4z + 2 + 5z - 3 = 9z - 1

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11z+√(4z)+√(10z)=11z+√(10z)+2*√(z)

9z

-8z + 12 = 12 - 4z-8z +4z + 12 = 12 - 4z +4z-4z + 12 -12 = 12 -12-4z / -4 = 0 / -4z = 0:)

7 + 4z = 437 + 4z -7 = 43 - 7 4z = 43 - 7 4z = 36 z = 9

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6z-4z-z = 6-7-4 z = -5

I used the matrix method to find the answer: x=4, y=-7, z=-5.

its 10x +9y +1z

3y + 4z + 12y = 3y -3y -3y ------------------------- 4z + 12y = 0 divide everything by 4 z + 3y = 0 -3y -3y z = -3y

z = 2 Factorised as (z - 2)(z - 2) = 0

5x-2y+3z-2x-y-4z=3x-3y-z

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