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Earn +20 ptsQ: X to the 4th power equals 16?
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When X to the second power minus 16 equals 0?
'x' is +4 or -4 .
What is f of x equals x to the 4th power minus 5x if f equals 3?
The idea is to replace every "x" by "3", and then do the calculations.
If x to the power of 2 equals 16 then x must equal 8 or -8?
No, because 8x8 is 64, not 16. The solution is 4 or -4.
What is 5x to the 4th power minus 1280?
That factors to 5(x - 4)(x + 4)(x2 + 16)
If x 7 equals 23 then x equals 16?
Yes, because: x+7 = 23 x = 23-7 x = 16
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