factorise it completely : 4x^3+7x^2-36x-63
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Step-by-step explanation:
f(x) = 4x³+7x²-36x-63
(x-3) is factor of f(x) as f(3)=0
x=3 | 4 7 -36 -63
| 0 12 57 63
_______________
4 19 21 | 0
______________
=(x-3)(4x²+19x+21)
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