Square of factorization factor (x's square + 3x) - 8 (x's square + 3x) - 20

Square of factorization factor (x's square + 3x) - 8 (x's square + 3x) - 20

(x²+3x)²-8(x²+3x)-20
Let X & # 178; + 3x = a
a²-8x-20
=(a-10)(a+2)
=(x²+3x-10)(x²+3x+2)
=(x+5)(x-2)(x+1)(x+2)