Question

plz repede imi trebuie maine

Answer 1

5.
c) ($2^{2}$ + $2^{4}$ + $2^{6}$ ) . x= $2^{3}$ + $2^{5}$ + $2^{7}$ 

(4+16+64) . x=8+32+128
(20+64) . x=40+128
84 . x = 168
x=168:84
x=2

Sper ca te-am ajutat ,insa nu am stiu a si b...

Answer 2

1. (x+1)(x+2)=72
x^2+2x+x+2-72=0
x^2+3x-70=0
Δ=9+280=289
x1=-3+17/2=14/2=7
x2=-10
2. 3x+2=5(x-2)
3x-5x+2+10=2
-2x=-10
x=5
3. (2^2+2^4+2^6)x=2^3+2^5+2^7
2^2(1+2^2+2^4)x=2^3(1+2^2+2^4)
4x=8
x=2