Question

Find the value of 64a^3 – 27b^3 – 180ab – 5, when 4a – 3b = 5

Answer 1

Answer:

4a-3b=5

cubing both sides

(4a-3b)^3=5^3

64a^3-27b^3-3*4a*3b(4a-3b)=125

64a^3-27b^3-36ab*5=125

64a^3-27b^3-180ab=125

ANS 125

Answer 2

Answer:

125

Step-by-step explanation:

4a-3b=5

By cubing both sides

(4a-3b)^3=5^3

64a^3-27b^3-3*4a*3b(4a-3b)=125

64a^3-27b^3-36ab*5=125

64a^3-27b^3-180ab=125

ans =125

mark brainlest