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xz_007 [3.2K]
3 years ago
8

Help!!!! What’s an appropriate method to solve 9x^2+3x-2=0??

Mathematics
1 answer:
shusha [124]3 years ago
5 0
To solve that use the Quadratic formula.
ax^{2} + bx + c = 0
9 {x}^{2}  + 3x - 2 = 0
Solve using:
x(1) =  \frac{ - b -  \sqrt{ {b}^{2}  - 4ac} }{2a}
and
x(2) =  \frac{ - b  +   \sqrt{ {b}^{2}  - 4ac} }{2a}
Answers are
x(1) =  \frac{1}{3}  \\ x(2) =   - \frac{2}{3}
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Step-by-step explanation:

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12 is what percentage of 80
PIT_PIT [208]

Answer:  " 15 % " .

_______________________________

     →   " 12 is <u>  15% </u> of 80 " .

_______________________________

Step-by-step explanation:

_______________________________

12 = (n/100) * 80 ;

12 = (80n) /100 ;  Solve for "n:

Note:  80/100 = (80/10) / (100/10) = (8/10) = 0.8  ;

12 = (0.8)n  ;

↔ (0.8n) = 12

Multiply each side of the equation by "10" ; to get rid of the "decimal" ;

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to get:

_______________________________

8n = 120 ;

Divide each side of the equation by "8" ;

to isolate "n" on ONE SIDE of the equation; & to solve for "n" ;

8n/8 = 120/ 8 ;

_______________________________

to get:

_______________________________

n = 15 .

_______________________________

Answer:  " 15 % " .

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     →   " 12 is <u>  15% </u> of 80 " .

_______________________________

Hope this helps!

Best wishes!

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4 0
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