Question

resolve para min por favo necessito pra amanha por fao

Answer 1

Vou fazer de ordem.


x-1 = 3-x
x+x = 3+1
2x = 4
x = 4÷2
x = 2



x+2 = 4-x
x+x = 4-2
2x = 2
x = 2÷1
x = 1



2-x = √x
(2-x)² = x
(2-x).(2-x) = x
4-2x-2x+x² = x
x²-4x-x+4 = 0
x²-5x+4 = 0

a=1; b=-5; c=4

Delta= b²-4×a×c
Delta= (-5)²-4×1×4
Delta= 25-16
Delta= 9


$x = \frac{ - b + ou - \sqrt{delta} }{2 \times a}$


$x = \frac{ - ( - 5) + ou - \sqrt{9} }{2}$


$x = \frac{5 + ou - 3}{2}$


$x1 = \frac{5 + 9}{2} = \frac{14}{2} = 7$

$x2 = \frac{5 - 9}{2} = - \frac{4}{2} = - 2$

S={-2, 7}






√x = 3
x = 3²
x = 9




√x+2 = x-4
√x = x-4-2
√x = x-6
x = (x-6).(x-6)
x = x²-6x-6x+36
x²-12x-x+36
x²-13x+36 = 0

a=1; b=-13; c=36

Delta= (-13)²-4×1×36
Delta= 169-144
Delta= 25


$x = \frac{13 + ou - 5}{2}$


$x1 = \frac{13 + 5}{2} = 9$

$x2 = \frac{13 - 5}{2} = 4$

S={4, 9}