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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Problem Solving: How to solve:
Supppose you have 10 coins that total $0.85. Some coins are dimes and others are nickels. How many of each do you have???? Can you help me simplify
(4+8i) * (-9 + i)
Thank you