Solve each equation by factorising: a. x + x 20 = 0 b. x 5x

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Solve each equation by factorising:

a. x² + x − 20 = 0 

b. x² − 5x + 6 = 0

c. x² − 3x − 28 = 0

d. x² + 13x + 42 = 0

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