Question

Resolva as seguintes equações do 2° grau

a) x² -7x = 0 b) x² + 5x = 0
c) 4x² -9x = 0 d) 3x² + 5x =0 e) 4x² -12x =0

Answer 1

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a) x² — 7x = 0

x(x — 7 ) = 0

x = 0 /\ x — 7 = 0

x = 0. /\ x = 7

sol : { 0 ; 7 }




b ) x² + 5 = 0

x(x+5) = 0

x = 0. /\ x+5=0

x = 0. /\ x = —5

sol : { —5 ; 0 }




C ) 4x² —9x = 0

x(4x — 9) = 0

x = 0. /\ 4x — 9 = 0

x = 0. /\ 4x = 9

x = 0. /\ x = 9/4

sol : { 0;4}




D) 3x² + 5x = 0

x(3x + 5) = 0

x = 0. /\ 3x + 5 = 0

x = 0. /\ 3x = —5

x = 0. /\ x = —5/3

sol : { 0; —5/3}



E ). 4x² — 12x = 0

x(4x — 12) = 0

x = 0. /\ 4x —12 = 0

x = 0. /\ 4x = 12

x = 0. /\ x = 12/4

x = 0. /\ x = 3

sol : { 0 ; 3 }

::::::espero ter ajudado:::::