Calculation question: I want the complete form! ! (1) a to the 5th power × (-a) to the 3rd power - (-a) to the 4th power × a to the 4th power (2) (x+y+3)(x+y-3)
1 Original formula=-a^8-a^4*a^4
=-a^8-a^8
=-2a^ 8
2 Original formula=(x+y)^2-3^2
=x^2+2xy+y^2-9