exam Maths Puzzle Numerical Ability

how do i find the x- intercepts of -x^4+1.5x^3+8x^2-1.5x-7?

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Help me please i dont know how to graph this! please explain??!

Graph
-y <_ 3x
Perform indicated operations

(x^2-11x+4)-(-2x^2+2x-6)-(X^2+6x-5)

Completely lost again! Thanks