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kari74 [83]
3 years ago
15

Evaluate the expression for x = 3, y=13 , and z = 5.

Mathematics
1 answer:
hoa [83]3 years ago
5 0

Answer:

-437

Step-by-step explanation:

x=3,y=13,z=5

12x-3y4x-z

12(3)-3(13)(4)(3)-5

36-468-5

-437

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Hint: | Move everything to the left hand side.Subtract -2 x^2 - 8 x + 6 from both sides:2 x^2 + 9 x - 6 = 0
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Hint: | Solve the quadratic equation by completing the square.Add 3 to both sides:x^2 + (9 x)/2 = 3
Hint: | Take one half of the coefficient of x and square it, then add it to both sides.Add 81/16 to both sides:x^2 + (9 x)/2 + 81/16 = 129/16
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