√40×2√18+3² = tolong jawab ya!!! (pakai cara)

√40 x 2 = √80
             = √16 x 5
             = 4√5

√18 + 3² = √18 + 9
              = √ 9 (2 + 1)
              = 3√3

4√5 x 3√3 = 12√15