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b) (3c + 4d)² + (4c - 3d)²=(3c+4d)(3c+4d) + (4c-3d)(4c-3d) =9c²+12cd+12cd+16d²+ 16c²-12cd-12cd+9d²=25c²+25d²
c) (3k + ⅖)²=9k²+12/5k+4/25
d) (1,2 + b)²=1,44+2,4b+b²
-41c³+44c²+6c
b) (3c + 4d)² + (4c - 3d)²=9c²+24cd+16d²+16c²-24cd+9d²=25c²+25d²
c) (3k + ⅖)²=9k²+12/5k+4/25
d) (1,2 + b)²=1,44+2,4b+b²
-35c³+28c²+18c²-6c³+6c-2c²= -41c³+44c²+6c
b) (3c + 4d)² + (4c - 3d)²=
9c²+24cd+16d²+16c²-24cd+9d²= 25c²+25d²
c) (3k + ⅖)²=
9k²+12/5k+4/25
d) (1,2 + b)²=
1,44+2,4b+b²