allerySolve x² − 9x + 20 = 0 by factorisation.
Ax = 4 or 5
Bx = 1 or 20
Cx = −4 or −5
Dx = 2 or 10
Answer & Solution
Correct answer: A. x = 4 or 5
The factors are (x−4)(x−5), so the roots are 4 and 5.
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