exam Maths Puzzle Numerical Ability

if 3√x^6 + 3√8x^3 + 3 √1=0, then x =
A -1
B 0
C 1
D 2
E 3

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exam Other Question

1. (2x + 7)(-3x^2 + 11x - 8)
2. 3x(-4x2 + 5x + 14)
3. (7x^3 + 3)(6x^5 - 2)
4. (3/4X^3 - 1/3)(1/5X^2 + 3/7)
5. (7x^3 - 11x^2 + 2x)(-4x^2 - 5x + 8)
6. (7x - 5)^2
7. (3x + how do you find the domain and range and roots without graphing the queation. We are not allowed to use a graphing calculator, so if I need to graph the problem, how would I do that? For example: h(x)=sqrt(x^2-6x+8)