apa jawaban dri nomor6-10 makasih

6. (x-5)²
= (x-5)(x-5)
= x²-5x-5x+25
= x²-10x+25

7. (2x-y) ²
= (2x-y) (2x-y)
= 4x²-2xy-2xy+y²
= 4x²-4xy+y²