5(x+10) 7(x-3) (x+10) (x+3)

5(x + 10)= 5X + 50 (5 dikalikan kedalam)
7 (x + 3) = 7X - 21(sama seperti diatas)
(x+10) (x+3) = ×^2 +3x+10x+30
= x^2+13x+30

1) 5(x+10)
=5x+50

2) 7 (x-3)
= 7x-21

3) (x+10) (x+3)
= x pangkat 2 +3x+10x+30
x pangkat 2 +13x +30