Bonjour;
A = 20x -50 +14x +21
= 34x -29
B= 10x² +45x -6x -27
= 10x² +39x -27
2x² +3x -10 = 25
2(-5)² +3*(-5) -10
= 2*25 -15 -10
= 50-25
= 25
vrai
Pythagore:
AC² = AB² + BC²
AC² -AB² = BC²
(7,3*7,3 ) - (5,5*5,5) = BC²
53,29 -30,25 = 23,04
BC = √23,04
BC = 4,8cm
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Bonjour;
A = 20x -50 +14x +21
= 34x -29
B= 10x² +45x -6x -27
= 10x² +39x -27
2x² +3x -10 = 25
2(-5)² +3*(-5) -10
= 2*25 -15 -10
= 50-25
= 25
vrai
Pythagore:
AC² = AB² + BC²
AC² -AB² = BC²
(7,3*7,3 ) - (5,5*5,5) = BC²
53,29 -30,25 = 23,04
BC = √23,04
BC = 4,8cm