Respuesta :

pips2367

Step-by-step explanation:

a)

(2x+5)(3x-2)+2(3x-2)

= 6x^2 -4x + 15x + 6x -4

= 6x^2 + 17 -4 = 25

therefore 6x^2 +17 -39 = 0

b) i)

using the quadratic formula:

x=3/2 or x=-13/3

ii)

2x+5

= 2(3/2) + 5 = 8

the longest side is 8 cm long