1) Escreva se a equação é completa ou incompleta: a) 3x² -6x =0 b) x² = 8x -15 2)Determine em cada equação os seus coeficientes: a) 7x² +13x -2 =0 b) x² -25 =0

3)Calcule as raízes da equação: a) x² + x -6 =0 b) x² -64 =0

4) Do quadrado de um número real subtraio o quádruplo desse mesmo número e o resultado é 60. Quais números reais satisfazem essa afirmação?

Bonjour,

1)

je ne sais pas ce que signifie une équation complète ou incomplète.

2)

Les coefficients sont peut-être ceux de ax²+bx+c=0

a)

a=7, b=13,c=2

b)

a=1,b=0,c=-25

3)

a) x²+x-6=0

(x+3)(x-2)=0

Sol={-3,2}

b)

x²-64=0

(x+8)(x-8)=0

sol={-8,8}

4)

Soit x le nombre cherché.

x²-4x=60

x²-4x-60=0

(x-10)(x+6)=0

Sol={10,-6}

Preuve:

si x=10 alors 10²-4*10=100-40=60

si x=-6 alors (-6)²-4*(6)=36+24=60

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.

answer: e 9, 5.75

step-by-step explanation:

step 1

find the variation ab in the x coordinate

delta x=(x2-x1)=10-> 8 units

find the variation ab  in the y coordinate 

delta y=(y2-y1)=6-> 2 units

step 2

find the coordinates point c

  x coordinate 

cx=ax+delta x*2/> cx=2+8*(2/> cx=3

  y coordinate 

cy=ay+delta y*2/> cy=4+2*(2/> cy=4.25

the coordinates of point c are (3,4.25)

step 3

find the coordinates point d

  x  coordinate 

dx=ax+delta x*4/> dx=2+8*(4/> dx=4

  y  coordinate 

dy=ay+delta y*4/> dy=4+2*(4/> dy=4.5

the coordinates of point d are (4, 4.5)

step 4

find the coordinates point e

  x  coordinate 

ex=ax+delta x*4/> ex=2+8*(6/> ex=5

  y  coordinate 

ey=ay+delta y*4/> ey=4+2*(6/> ey=4.75

the coordinates of point e are (5, 4.75)

step 5

find the coordinates point f

  x  coordinate 

fx=ax+delta x*4/> fx=2+8*(8/> fx=6

  y  coordinate 

fy=ay+delta y*4/> fy=4+2*(8/> fy=5

the coordinates of point f are (6,5)

step 6

find the coordinates point g

  x  coordinate 

gx=ax+delta x*4/> gx=2+8*(10/> gx=7

  y  coordinate 

gy=ay+delta y*4/> gy=4+2*(10/> gy=5.25

the coordinates of point g are (7,5.25)

step 7

find the coordinates point h

  x  coordinate 

hx=ax+delta x*4/> hx=2+8*(12/> hx=8

  y  coordinate 

hy=ay+delta y*4/> hy=4+2*(12/> hy=5.5

the coordinates of point h are (8,5.5)

step 8

find the coordinates point i

  x  coordinate 

ix=ax+delta x*4/> ix=2+8*(14/> ix=9

  y  coordinate 

iy=ay+delta y*4/> iy=4+2*(14/> iy=5.75

the coordinates of point i are (9,5.75)

- r3ktforgood ☕