Question

Factorise: 5(3x+y)square+ 6(3x+y)-8​

Answer 1

Answer:

(15x+5y-2)(3x+y+2)

Step-by-step explanation:

Let 3x+y=z

$5z^{2} +6z-8$

Using splitting of middle terms-

$5z^{2} +10z-4z-8\\5z(z+2)-2(z+2)\\(5z-2)(z+2)$

Substituting z

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

(15x+5y-2)(3x+y+2)