pls pls.pls solve this allll
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1) √7 - 3 is irrational, because √7 is irrational, and the difference between a rational and irrational number is irrational.
3) (3√2+2√3)^2 x (3√2-2√3)^2 [(a+b)^2 x (a-b)^2]
18 + 12 + 12√6 x 18 + 12 - 12√6
= 30 + 12√6 x 30 - 12√6
= 900 - 864
= 36
4) let x = 2.4178178178...
10x = 24.178178...
10000x= 24178.178178...
9090x=24154
x= 24152/9090
= 12076/4545
5) 3^2 x √3 x -√3^3
9 x √3 x -√27
= -9 x 9
= -81
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