Question

x的平方减5}的2次方+8{5-x的2次方}加16

Answer 1

是x^2-5^2+8(5-x^2)+16

还是(x^2-5)^2+8(5-x^2)+16

如果是因式分解的话就是(x^2-5)^2+8(5-x^2)+16=(x^2-5)^2-8(x^2-5)+16=(x^2-5)^2+(-4-4)(x^2-5)+(-4)*(-4)=((x^2-5)-4)^2=(x^2-9)^2