Zahra spent $20.50 on 10 party favors for her party. the boys each received a puzzle book that cost $1.75 each. the girls each received a magic trick that cost $2.25 each. how many boys and how many girls attended the party? none of the other answers are correct 4 boys and 6 girls 5 boys and 5 girls 6 boys and 4 girls 7 boys and 3 girls

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

the answer is b