Question

x+2=-5

x²+2x-3=0

x+4=10

-3x+2=-7

0.5x+4=-1

Answer 1

x+2=-5

x =-7

x²+2x-3=0

(=) x²-x+3x-3=0

(=) x(x-1)+3(x-1)=0

(=) (x-1)(x+3)=0

=> x-1 = 0 hoặc x+3 = 0

x = 1 x =-3

x+4 = 10

x = 6

-3x + 2 =-7

(=) -3x =-9

(=) x = 3

0.5x + 4 = -1

(=) 0.5x =-5

(=) x =-10

Chúc bạn học tốt ^^

Answer 2

a)x+2=-5

\(\Leftrightarrow\)x =-7

b)x²+2x-3=0

\(\Leftrightarrow\)x²-x+3x-3=0

\(\Leftrightarrow\)x(x-1)+3(x-1)=0

\(\Leftrightarrow\)(x+3)(x-1)=0

\(\Rightarrow\)x+3=0 hoặc x-1=0

\(\Rightarrow\)x=-3 hoặc x=1

c)x+4=10

\(\Leftrightarrow\)x=6

d)-3x+2=-7

\(\Leftrightarrow\)-3x =-7-2

\(\Leftrightarrow\)3x =-9

\(\Leftrightarrow\)x =-3

e)0,5x+4=-1

\(\Leftrightarrow\)0,5x =-1-4

\(\Leftrightarrow\)0,5x = -5

\(\Leftrightarrow\)x =-5:0,5

\(\Leftrightarrow\)x =-10