Question

Resolva as equações

A ) x ² = 25

B ) x² - 100 = 0

C ) 5 x² - 45 = 0

D ) x² - 7x = 0

E ) 2x² - 16 c = 0

F ) 5x² + 20x = 0

G )  - 2 x²  - 42 x = 0

Answer 1

A)x=5
B)x=10
C)5x-45=0
5x=45/5
R: x=9
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Answer 2

A ) x ² = 25
x=+-√25
x'=5 e x"=-5

B ) x² - 100 = 0
x²=100
x=+-√100
x'=10 e x"=-10

C ) 5 x² - 45 = 0
5 x² =45
x² =45/5
x² =9
x=+-√9
x'=3 e x"=-3

D ) x² - 7x = 0
x•(x-7)=0
x'=0
x-7=0
x=7
x'=0 e x"=7

E ) 2x² - 16x = 0
x(2x-16)=0
x=0
2x-16=0
2x=16
x=16/2
x=8
x'=0 e x"=8

F ) 5x² + 20x = 0
x(5x+20)=0
x=0
5x+20=0
5x=-20
x=-20/5
x=-4
x'=0 e x"=-4

G )  - 2 x²  - 42 x = 0
x(-2x-42)=0
x=0
-2x-42=0
-2x=42
x=42/-2
x=-21
x'=0 e x"=-21