The Total solution for NCERT class 6-12
4x – 5z = 16, xz = 12Cubing both sides,(4x – 5z)3 = (16)3⇒ (4x)3 –(5y)3 – 3 x 4x x 5z(4x – 5z) = 4096⇒ 64x3 –125z3 – 3 x 4 x 5 x xz(4x – 5z) = 4096⇒ 64x3 – 125z3 – 60 x 12 x 16 = 4096⇒ 64x3 –125z3 – 11520 = 4096⇒ 64x3 – 125z3 = 4096 + 11520 = 15616