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b) ( √2x - √3y)( √2x + √3y) =2x² - 3y²
c) ( √3y-1)²=(√3y)² - 2 * √3y * 1 +1² =3y²-2√3y +1
5.( √3+2)( √3 -2) + ( √2- √8)² =3-4 + (√2)² - 2*√2* √8 +(√8)²=
3-4+2-8+8=1
7. 4x²y³ + 20x³y² - 12x²y² =4x²y²(y+5x-3)
8. (a-2)(3a+5)= (2√3 +1-2)[3(2√3+1)+5] =(2√3-1)(6√3+1+5)=
(2√3-1)(6√3+6)=36+12√3-6√3-6 = 30+6√3