Question

Cat mai repedeeee!!!!​

Answer 1

Răspuns:

Explicație pas cu pas:

a)x=-5

b)x=-7

c)x=-12

d)x=-10

e)x=-9

f) x=-15

g)2x²=800     ⇒x=-20

h)x=-3

Answer 2

Răspuns:

a)x²=25

x=5

b)x²=49

x=7

c)x²=144

x=12

d)2x²=200

200:2=100

x²=100

x=10(Nu sunt 100% sigură)

e)x²+1=82/-1

x²=81

x=9

f)x²-15=210/+15

x²=225

x=15

g)2x²+16=816/-16

2x²=800/:2

x²=400

x=20

h)-x²+5=-4/-5

-x²=-9

-x=-3