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kumpel [21]
2 years ago
6

What are the solutions of the equation 9x4 - 2x2 - 7 = 0? Use u substitution to solve.

Mathematics
1 answer:
avanturin [10]2 years ago
8 0
9x^4 - 2x^2 - 7 = 0
(x + 1)(x - 1)(9x^2 + 7) = 0
Therefore, x = -1 , OR x = 1.

9x^2 + 7 has no real solutions.

Hope it helps : )
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3 years ago
A dinner check is to be split among 3 people. Greg’s portion of the check is twice Kelly’s. Joe’s portion is $1.50 less than 4 t
defon

Answer:

Kelly owes $16.5

Greg owes $33

Joe owes $64.5

Step-by-step explanation:

Let

Kelly's portion = x

Greg's portion = 2x

Joe's portion = 4x - 1.50

Total bill = $114.00

Total bill = Kelly's portion + Greg's portion + Joe's portion

114 = x + 2x + (4x - 1.50)

114 = 3x + 4x - 1.50

114 = 7x - 1.50

Add 1.50 to both sides

114 + 1.50 = 7x - 1.50 + 1.50

115.5 = 7x

Divide both sides by 7

x = 115.5 / 7

= 16.5

x = $16.5

Kelly's portion = x

x = $16.5

Greg's portion = 2x

= 2 × 16.5

= $33

Joe's portion = 4x - 1.50

= 4(16.5) - 1.50

= 66 - 1.50

= $64.5

Therefore,

Kelly owes $16.5

Greg owes $33

Joe owes $64.5

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3 years ago
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