Hi,

Could you please explain how to solve these two sums, step by step please.

1.

2.

This is as far as I got on both sums:

1.

2.

Any help would be greatly appreciated,

Thanks,

Dru

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- May 18th 2009, 01:26 AM22upon7Solving Cubic Equations
Hi,

Could you please explain how to solve these two sums, step by step please.

1.

2.

This is as far as I got on both sums:

1.

2.

Any help would be greatly appreciated,

Thanks,

Dru - May 18th 2009, 01:32 AMRapha
Hi.

Good thinking, but you made a mistake

OKAY

Not okay, you divided by x; you can do that, but this is only for ; and x = 0 is a solution!

So

is better,

now you know x = 0 is a solution and x²-8 = 0 leads to the other solutions; you still have to solve x²-8= 0, tho.

The last step seems to be unnecessary

// ^(1/3)

You're welcome.

Yours, Rapha