4. Sekeping poskad yang berbentuk segiempat tepat mempunyai panjang 1.5 cm dan lebar 10 cm. Cari luas poskad itu dalam unit mm².

for this case we must apply distributive property to the following expression:

the distributive property states that:

then, when applying the property we have to multiply the -2 for each term within the parenthesis:

you first to choose the points and then move from then as the slope you have