a) Write the expansion of (5a-3b)³
b) Solve the system of simultaneous linear equations:
4x - 3y = 11
6x +7y=5
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Step-by-step explanation:
a) (5a - 3b)³
(5a)³- (3b)³-3×5a×3b(5a-3b)
125a³-27b³-45ab(5a-3b)
125a³-27b³-225a²b+135ab²
b) 4x-3y=11. ×7
6x+7y=5. ×3
28x-21y=77
18x+21y=15
___________
46x=92
x=92/46=2
y=> 4×2-3y=11
8-3y=11
y= -1
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