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wlad13 [49]
3 years ago
15

Solve any method: 9x^2+9x=4??

Mathematics
2 answers:
Gala2k [10]3 years ago
6 0
Subtract 4 from both sides, solve using quadratic formula
ax^2+bx+c
(-b(+or-) Square Root of b^2 - 4ac)/2a

9x^2+9x-4=0
-9(+or-)Square root of 9^2-4(9)(-4)/2(9)

Solve^
svetoff [14.1K]3 years ago
4 0
9x² + 9x = 4
9x² + 9x - 4 = 4 - 4
9x² + 9x - 4 = 0
x = <u>-9 +/- √(9² - 4(9)(-4))</u>
                2(9)
x = <u>-9 +/- √(81 + 144)</u>
                 18
x = <u>-9 +/- √225
</u>            18
x = <u>-9 +/- 15</u>
           18
x = <u>-9 + 15</u>    x = <u>-9 - 15</u>
          18                 18
x = <u>6</u>             x = <u>-24</u>
     18                    18
x = 1/3            x = -1 1/3
         
<u />
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-3x^2 + 2y^2 + 5xy - 2y +5x^2 - 3y^2

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The expression for 7 less than the product of a number and 8, increased by a number multiplied by 2 is 8n-7 +2n

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7 less than the product of a number and 8, increased by a number multiplied by 2

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