Question

How to solve this both problem?​

Answer 1

#9

#a

$\\ \sf\longmapsto (y+2z)^3$

$\\ \sf\longmapsto y^3+2z^3+3y^2(2z)+3y(2z)^2$

$\\ \sf\longmapsto y^3+8z^3+6y^2z+12yz^2$

#b

Refer to attachment

#10

• x=y
• x=40°(Corresponding angle)
• y=x=40°