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MariiahEduarda155
@MariiahEduarda155
December 2019
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Alguém pode me ajuda em algumas coisas que eu estou em duvidas
a) -20=-x-x²
b) (2x - 3 ) (x -8)=34
c) 13-2x-15x²=0
d)4x²+7x+3= 2x²+2x
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mariireiss
A) -20 = -x+x
-20 = -x (.-1)
20 = x,,
b) 2x - 3 . x -8 = 34
3x -11 = 34
3x = 34 +11
3x/3 = 45/3
x = 15,,
c) 13 -2x -225x = 0
-227x/227 = -13/227
-x = -13/227 (.-1)
x = -13/227,,
d) 16x +3 = 4x -5x
+3 = -x -16x
+3 = -17x (.-1)
-3/17 = +17x/17x
-3/17 = x,,
1 votes
Thanks 0
exalunosp
A
-20 = -x -x²
-20 + x + x² = 0
x² + x - 20 = 0
delta = 1 + 80 = 81 ou +-V81 = +-9 ***
x = ( -1 +-9)/2
x1 = -10/2 = -5
x2 = 8/2= 4 ***
b
( 2x - 3) ( x - 8 ) = 34
2x² - 16x - 3x + 24 - 34 = 0
2x²- 19x - 10 = 0
delta = 361 + 80 = 441 ou +-V441 = +-21 ***
x = ( 19 +-21)/4
x1 =40/4 = 10***
x2 = -2/4 = -1/2 ***
c
13 - 2x - 15x² = 0
15x² + 2x - 13 = 0
delta = 4 + 780 = 784 = +-V784 = +-28 ***
x = ( 4 +-28 )/30
x1= 32/30 = 16/15 ***
x2 = -24/30 = - 4/5 ****
d
4x² + 7x + 3 = 2x² +2x
4x² - 2x² + 7x - 2x + 3 = 0
2x² + 5x + 3 = 0
delta = 25 -24 = 1 ou +-V1 = +-1 ***
x = ( -5 +-1 )/4
x1 = -6/4 = - 3/2 ***
x2 = -4/4 = -1 ***
1 votes
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-20 = -x (.-1)
20 = x,,
b) 2x - 3 . x -8 = 34
3x -11 = 34
3x = 34 +11
3x/3 = 45/3
x = 15,,
c) 13 -2x -225x = 0
-227x/227 = -13/227
-x = -13/227 (.-1)
x = -13/227,,
d) 16x +3 = 4x -5x
+3 = -x -16x
+3 = -17x (.-1)
-3/17 = +17x/17x
-3/17 = x,,
-20 = -x -x²
-20 + x + x² = 0
x² + x - 20 = 0
delta = 1 + 80 = 81 ou +-V81 = +-9 ***
x = ( -1 +-9)/2
x1 = -10/2 = -5
x2 = 8/2= 4 ***
b
( 2x - 3) ( x - 8 ) = 34
2x² - 16x - 3x + 24 - 34 = 0
2x²- 19x - 10 = 0
delta = 361 + 80 = 441 ou +-V441 = +-21 ***
x = ( 19 +-21)/4
x1 =40/4 = 10***
x2 = -2/4 = -1/2 ***
c
13 - 2x - 15x² = 0
15x² + 2x - 13 = 0
delta = 4 + 780 = 784 = +-V784 = +-28 ***
x = ( 4 +-28 )/30
x1= 32/30 = 16/15 ***
x2 = -24/30 = - 4/5 ****
d
4x² + 7x + 3 = 2x² +2x
4x² - 2x² + 7x - 2x + 3 = 0
2x² + 5x + 3 = 0
delta = 25 -24 = 1 ou +-V1 = +-1 ***
x = ( -5 +-1 )/4
x1 = -6/4 = - 3/2 ***
x2 = -4/4 = -1 ***