Question

Simplify a) √242 + √128 − √72
b ) (3√5 + 2) (3√5 − 2)
pls answer step by step

Answer 1

A) |242 = |2 × |121 = 11|2

|128 = |36 × |4 = 6 × 2 = 12

|72 = |36 × |2 = 6|2

11|2 + 12 - 6|2 = 5|2 + 12

B) (3|5 × 3|5) + (3|5 × -2) + (3|5 × 2) + (2 × -2)

[middle terms cancel out]

(|45 × |45) + (-4)

45 - 4 = 41

I haven't practiced math in a while but I think these are right if my memory serves me correctly.