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b. √5 x √5 + √5 x √7 - √7x√5 - √7 x √7 = 5 - 7 = -2
c. √7 x √7 + √7x√12 +√12x√7 + √12x√12 = 7 + 2√84 + 12 = 19 + 4√21
d. √10 x √10 - √10 x √8 -√8x√10 + √8 x √8 = 10 - 4√20 + 8 = 18 - 4√20
e. -√7 x -√7 - √7 x √12 - √12 x √7 + √12 x √12 = 7 - 4√21 + 12 = 19 - 4√21
= 2- √10 + √10 - 5 = - 3
b. (√5 x √5 + √5 x √7) - (√7x√5 - √7 x √7)
= 5 + √35 - √35 - 7 = -2
c. (√7 x √7 + √7x√12) +(√12x√7 + √12x√12)
= 7 + 2√84 + 12
= 19 + 4√21
d. (√10 x √10 - √10 x √8) -(√8x√10) + √8 x √8)
= 10 - 4√20 + 8
= 18 - 4√20
e. (-√7 x -√7 - √7 x √12) - (√12 x √7 + √12 x √12)
= 7 - 4√21 + 12
= 19 - 4√21