Question

Sederhanakan (2 akar 5 - 3 akar 3) × (2 akar 5 + 3 akar 3)

Answer 1

(2√5 - 3√3) x (2√5 + 3√3)
= (2√5 x 2√5) + (2√5 x 3√3) - (2√5 x 3√3) - (3√3 x 3√3)
= 20 + 6√15 - 6√15 - 27
= 20 - 27
= -7