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Simora [160]
3 years ago
5

6x^{2} + 19 + 9x^{2} - 8 With Explanation

Mathematics
1 answer:
NemiM [27]3 years ago
7 0

Answer:

I'mnot sure if you're asking for its roots..but here you go :)

Step-by-step explanation:

= 6 {x}^{2} + 19 + 9 {x}^{2}   - 8 \\  = (6 {x}^{2}  + 9 {x}^{2} ) + (19 - 8) \\  = 15 {x}^{2}  + 8 \\ 15 {x}^{2}  =  - 8 \\  {x}^{2}  =   - \frac{8}{15} \\  \sqrt{ {x}^{2} }  =  \sqrt{  - \frac{8}{15} }   \\ x =  \sqrt{ \frac{8}{15}}  \times  \sqrt{ - 1}  \\ x =  \sqrt{ \frac{8}{15} }  \times i \\  x1 = 0.7302i \\ x2 =  - 0.7302i

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2 years ago
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exis [7]

Answer: choice A. 40 liters

====================================

Explanation:

x = number of liters of the 50% alcohol solution

If we have x liters of 50% alcohol, then we have 0.50*x liters of pure alcohol. This is added to 0.90*40 = 36 liters of pure alcohol (from the 90% solution).

So far we have 0.50*x + 36. This expression represents the total amount of pure alcohol. We want a 70% solution, so we want 70% of the total 40+x meaning 0.50*x + 36 is to be set equal to 0.70*(40+x) and we solve for x as shown below

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So that is why the answer is choice A. 40 liters

6 0
3 years ago
Help please, this is a math question. &lt;3
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