Question

help for my question pls​

Answer 1

Answer:

a) 19.5 is the answer.

b) 0.26 is the answer.

c) 4 is the answer.

Step-by-step explanation:

a) (3+√5) (2+√3) = (3+2.23) (2+1.73)

= (5.23) (3.73)

= 19.5.

b) (√5-√3)² is similar as (a- b)² formula so, a=√5,b=√3 and the formula is a²-2ab+b² when we use that formula

(√5-√3)² = (√5)²-2√15+(√3)²

= (5)-2√15+(3)

= 8-2√15

= 8-2(3.87)

= 8-7.74

= 0.26

c) (√11+√7) (√11-√7) is similar as (a+b) (a-b) formula so, a=√11,b=√7 and the formula is a²-b² when we use that formula

(√11+√7) (√11-√7) = (√11)²- (√7)²

= (11) - (7)

= 4

Hope you understand and it helps.