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x² + x² = 20²
2x² = 400
x² = 200
x =√200 = √100(2)= 10√2
B.
(3x)² + (4x)² = 10²
9x² +16x² = 100
25x² = 100
x² = 4
x= 2
c.
x² + (2x)² = (2√5)²
x² + 4x² = 20
5x² = 20
x² = 4
x =2