Question

Please explain
without using tables or a calculator evaluate ​

Answer 1

49.2

9

Explanation:

7.46² - 2.54² = (7.46 - 2.54)(7.46 + 2.54)

= (4.92)(10)

= 49.2

(1 x 4) x 3 = [1² + √(1 x 4)] x 3 = [1 + √4] x 3 = [1 + 2] x 3 = 3 x 3 = 9