exam Maths Puzzle Numerical Ability

factoring: quadratic equations and completing the square
a^6-4a^3-21=0

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exam Other Question

Solve by graphing.
2x+y=-4
y=2 a ladder is resting against a wall. the top of the ladder touches the wall at the height of 18 ft. find the length of the ladder if the length is 6 ft more than its distance from the wall