Question

Calcule os valores do x:
e) -7ײ+21×=0
f) 2ײ-11×=0
h) 25ײ+100=0
i) 3ײ-7×=0​

Answer 1

Explicação passo-a-passo:

e) - 7x² +21x=0

-7x.(x + 3)=0

-7x=0

x= 0/-7

x= 0

x+3=0

x= -3

S={0,-3}

e) 2x²- 11x=0

x(2x - 11)=0

x=0

2x -11=0

2x= 11

x= 11/2

S={0,11/2}

h) 25x²+ 100x=0

25x(x + 4)=0

25x=0

x=0/25

x=0

x+4=0

x= -4

S={0, -4}

i) 3x² - 7x=0

x(3x -7)=0

x=0

3x -7=0

3x= 7

x= 7/3

S={0,7/3}