Question

Me ajudem por favorzinho

Answer 1

A )x-6 = 10

x= 10+6

x= 16

B)X+20=8

X= 8-20

X= -12

C)7 - X =4

X= -4+7

X=3

D) 6+x=19

x=19-6

x=13

2)

A) 3X=15

X=$\frac{15}{3}$

X=5

B) 2X=100

X=$\frac{100}{2}$

X=50

C) 20X=-2

X=$\frac{-2}{20}$

X= $-\frac{1}{10}$

3)

A) 2X-70= -10

2X=-10+70

2X=60

X=$\frac{60}{2}$

X=30

B) 3 [5X-$2^{2}$]=3

5X+4+3=3

5X=3-7

5X=-4

X=$-\frac{4}{5}$

C) 5(X+3) -2X(X-1)=20

5x-$2x^{2}$+15+2=20

-$2x^{2}$+5x-3=0

x= Δ=$5^{2}$-4.(-2).(-3)

x=Δ=25-24= 1

$x_{1}$=$\frac{-5+\sqrt{1} }{2.(-2)}$=$\frac{-4}{-4}$=1

$x_{2}$=$\frac{-5-\sqrt{1} }{2.(-2)}$=$\frac{-6}{-4}$=$\frac{-3}{-2}$