exam Maths Puzzle Numerical Ability

write the quadratic formula...

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exam Other Question

Find the solution to the equation: 6x - 3 = -2x + 21.

Find the solutions to the equation: x2 + 2x - 8 = 0.

Find the solutions to the equation: x-5/x = 4.

Solve the inequality 21/15-3x<0, and express the solution as an interval. Which is the negitive -|4| or |-4| I have no idea. Thanks