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sweet-ann [11.9K]
3 years ago
9

What is the answer of: z^2 - 4z^2

Mathematics
1 answer:
Novosadov [1.4K]3 years ago
4 0
z^2 - 4 z^2

z - 4z

= - 3 z^2

hope this helps!.
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Answer:

  • y = 8
  • RS = 51
  • ST = 29

Step-by-step explanation:

(a) You use the fact that the lengths RS and ST total the length RT.

  RS +ST = RT

  (6y+3) +(3y+5) = 80 . . . . . substitute the given values

  9y +8 = 80 . . . . . . . . . . . . .simplify

  9y = 72 . . . . . . . . . . . . . . . .subtract 8

  72/9 = y = 8 . . . . . . . . . . . .divide by the coefficient of y

___

(b) Now, the value of y can be substituted into the expressions for RS and ST to find their lengths.

  RS = 6y +3 = 6·8 +3

  RS = 51

  ST = 3y +5 = 3·8 +5

  ST = 29

___

<em>Check</em>

  RS +ST = 51 +29 = 80 = RT . . . . the numbers check OK

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3 years ago
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