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= -108
b.( -5k)³ =( -5 × 6) ³
= -30³= -900
c. (2k -9 )² = (2 × 6 -9)² = 9² = 81
d. -3k² + 7k = -3 × 6² + 7 × 6 = -108 + 42 = -6
e. k³ - (k-6)² = 6³ - ( 6 - 6)² = 216 - 0² = 216
f. 3k² + 5k = 3 × 6² + 5×6 = 108 + 30= 138
2. a. a² - 8a = -5² -8 × -5 = 25 +40 = 65
b. 4q + 3pq ² = 4 × 6 + 3 × 6 ×-4² = 24 + 18 × 16 = 24 + 288 = 312
c. 5m³ - 2m²n = 6 × -4³ -(2 × -4² × -6) = 6 × -64 - (2 × 16 × -6) = -384 - 192 = -576
4. a. k = 2(2x+ 5 ) + 2 (3y - 2 )
k = 4x + 10 + 6y - 4
k = 4x + 6 + 6y
L = 2x + 5 × 3y - 2
L = 2X + 15 Y - 2
b. K = 4 × 4 + 6 + 6 ×3
= 16 + 6 + 18
= 40
L = 2 × 4 + 15 × 3 -2
= 8 + 45 -2
= 51