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Sagot :
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^
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^
9x² + 9x = 4
9x² + 9x - 4 = 4 - 4
9x² + 9x - 4 = 0
x = -9 +/- √(9² - 4(9)(-4))
2(9)
x = -9 +/- √(81 + 144)
18
x = -9 +/- √225
18
x = -9 +/- 15
18
x = -9 + 15 x = -9 - 15
18 18
x = 6 x = -24
18 18
x = 1/3 x = -1 1/3
9x² + 9x - 4 = 4 - 4
9x² + 9x - 4 = 0
x = -9 +/- √(9² - 4(9)(-4))
2(9)
x = -9 +/- √(81 + 144)
18
x = -9 +/- √225
18
x = -9 +/- 15
18
x = -9 + 15 x = -9 - 15
18 18
x = 6 x = -24
18 18
x = 1/3 x = -1 1/3
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