Which reaction is balanced correctly? c 6h 12o6 + 3o 2 → 6co 2 + 6h 2o ch 4 + 4o 2 → co 2 + 2h 2o c 3h 8 + 5o 2 → 3co 2 + 4h 2o c + o 2 → 2co 2

answer: for each 3 girls there is 2 boys . 3: 2

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x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15