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Respostas

1.

a ) –  

x² = 12² + 9²

x² = 144 + 81

x² = 225

x = 15

b ) –  

5² = 4² + x²

25 – 16 = x²

x² = 9

x = 3

c ) –  

10² = 8² + x²

100 – 64 = x²

x² = 36

x = 6

d ) –  

20² = (4x)² + ( 3x)²

400 = 16x² = 9x²

400 = 25x²

x² = 20² / 5²

x = 20 / 5

x = 4

e ) –  

( x + 1 )²= (3)² + x²

x² + 2x + 1 = 9 + x²

2x = 8

x = 4

f ) –  

( 2x )² = x² + ( 3 v3 )²

4x² = x² = 27

3x² = 27

x² = 9

x = 3