exam Maths Puzzle Numerical Ability

What exactly is a discrimanent? (sorry about the spelling)

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exam Other Question

Please solve z+5 over 2 is less than 4-z over 7 Simplify rational expressions

y^5-3y^3+8y^2 divided by 5y = y^4/5 -3y^2/5 + 8y/5