exam Maths Puzzle Numerical Ability

Over which interval is the function decreasing?

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exam Other Question

2X-3Y-2Z=12
X+4Y+Z=-9
4X+2Y-3Z=6
Question: Solve using linear combination and by matrices. Write the matrices you typed into calculator and the operations it took to solve the system let f(x)=3-8x2+17x-9. use the factoe theorem to find other soulations to f(x)-f(1)=0, besides x=1