Question

Multiply and then simplify completely: ( 8 + √ 10 ) ( 8 − √ 10 )

Answer 1

54.

Explanation:

( 8 + √ 10 ) ( 8 − √10)

= 8*8 - 8√10 + 8√10 +√10 * -√10

= 64 - 8√10 + 8√10 - 10

The 2 middle turns cancel out so we have:

64 - 10

= 54.