Question

因式分解：(x+3x)^2+x+3x-2

Answer 1

是(x²+3x)²+(x²+3x)-2
=(x²+3x+2)(x²+3x-1)
=(x+1)(x+2)(x²+3x-1)

Answer 2

不
log4(x)
=lgx/lg4
=lgx/2lg2
=1/2*log2(x)
原式=(3+a)²-4(3+a)(3-a)+4(3-a)²
=[(3+a)-2(3-a)]²
=(3a-3)²
=9(a-1)²