Mathematics, 28.07.2019 16:30 Hruai
Ivy has 4 tiles with pictures of plants and 5 tiles with pictures of animals. ivy keeps all the tiles on a mat with the pictures hidden and mixes them up. she then turns 1 tile face up and finds the picture of a plant on it. she removes this tile from the mat and turns another over tile without looking. what is the probability that the second tile that ivy turns over has a plant on it?
Answers: 1
Answer from: Quest
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
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