exam Maths Puzzle Numerical Ability

May I have some help with the following equation?

Find all real solutions of the equation.

x^8 + 15x^4=16

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exam Other Question

The $75 dollar cost for a party was to be shared equally by all those attending. Since 5 more people attended than was expected, the price per person dropped by 50 cents. How many people attended the party? Find the intercepts and then use them to graph the equation.

y= -5-5x