Question

6. (8-y)(y+3)=...?
7. (3a pangkat 2+b pangkat 2)(a pangkat 2- b pangkat 2)=...?
8. (x pangkat 2-x-2)(x+3)=...?
9. (a+b)(a-b)=...?
10.(5y+3)(5y-3)=...?
11.(7-y)(y+7)=...?

Answer 1

Nomor 6 (8-y)(y+3)=8y+24-y(pangkat 2)-3y= 5y+24-y(pangkat 2) Nomor 9 (a+b)(a-b)= a pangkat 2-ab+ab-b pangkat 2 = a pangkat 2-b pangkat 2 Nomor 11 (7-y)(y+7)=7y+49-y pangkat 2-7y=7y-7y+49-y pangkat 2= 49-y pangkat 2