Question

a + b = 8 and a - b = 4 then 8ab (a2 + b2 ) = ?​

Answer 1

Answer:

4992

Step-by-step explanation:

a+b = 8 , a-b = 4

add both equations we get 2a = 12

a = 6 and b = 2

we know that [a+b]^2 = [a-b]^2+4ab

                       8^2 = 4^2+4ab

                        4ab = 48

                          ab = 12

so 8ab (a2 + b2 )

= 8[12][6^2+4^2] = 4992