Answer:
b = 2
Step-by-step explanation:
a² + b² = c²
(3b)² + b² = (2[tex]\sqrt{10}[/tex] )²
(3b)(3b) + b² = ( 2[tex]\sqrt{10}[/tex] ) (2[tex]\sqrt{10}[/tex] )
9b² + b² = 4 ([tex]\sqrt{100}[/tex] )
9b² + b² = 4(10)
10b² = 40
b² = 40/10
b² = 4
b = [tex]\sqrt{4}[/tex]
b = 2
