Question

Using the identity (a+b) (a-b) = a square - b square evaluate the following:
9 1 by 4 × 15 3 by 4

Answer 1

Answer:

91×4×153×4

= 222768

a square - b square + 2ab

Answer

Answer 2

Answer:

the ans is 145. whole 11/16

Step-by-step explanation:

9x1/4 is 37/4 and 15x3/4 is 63/4

the square of 1/4 is 1/16

so, 1/16(50-13) (50+13)

1/16(50^2 - 13^2)

1/16(2500-169)

1/16 x 2331 is 2331/16

so after dividing the ans is145 whole 11/16