Question

i) {7*(-3)} * 5 = 7 *{(-3) 5}}​

Answer 1

Step-by-step explanation:

{7*(-3)}*5 = 7*{(-3)5}

(-21)*5 = 7*(-15)

(-105) = (-105)

Answer 2

Answer:

7+3√5)/(7-3√5) - (7-3√5)/(7+3√5) = a +b√5 .