Question

8.5 × 11.5 by using algebric identities​

Answer 1

Answer:

97.75

Step-by-step explanation:

8.5 = 10 - 1.5

11.5 = 10 + 1.5

Therefore,

(10+1.5)(10-1.5) algebraic identity: (a + b)(a-b) = a² - b²

= 10² - 1.5²

= 100 - 2.25

= 97.75

Answer 2

Answer:

8.5*11.5

(10-1.5)(10+1.5) [using (a+b)(a-b)]

10square-1.5square

=97.75