Question

A= x + 15° e B= 2x - 30 são
complementares, encontre
valor de x
​

Answer 1

Resposta:

A=50

B=40

Explicação passo-a-passo:

Se eles são complementares a soma deles dá 90°:

A+B=90°

Logo:

x+15 + 2x-30= 90°

x+15 + 2x-30= 90°3x+15-30 = 90°

x+15 + 2x-30= 90°3x+15-30 = 90°3x-15=90°

x+15 + 2x-30= 90°3x+15-30 = 90°3x-15=90°3x=90+15

x+15 + 2x-30= 90°3x+15-30 = 90°3x-15=90°3x=90+153x= 105

x+15 + 2x-30= 90°3x+15-30 = 90°3x-15=90°3x=90+153x= 105x=105/3

x+15 + 2x-30= 90°3x+15-30 = 90°3x-15=90°3x=90+153x= 105x=105/3x=35

Logo:

A= x+15

A= x+15A=35+15

A= x+15A=35+15A=50

B= 2x-30

B= 2x-30B= 2×35-30

B= 2x-30B= 2×35-30B= 70-30

B= 2x-30B= 2×35-30B= 70-30B=40