3. a) Factorise : 3x2 - 5x - 12.
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Answer:
x = +3 or x= -4/3
Step-by-step explanation:
let:-
-5x-12 = 0
=> -9x+4x-12 = 0 ----[splitting -5x into -9x+4x]
=>3x(x-3)4(x-3) = 0
=>(x-3)(3x+4) = 0
==> x = 3 or x= -4/3
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