Find the roots for:   x^2-2x-15=0

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x^2-2x-15=0-questionx^2-2x=15 -adding like terms together and dividing both sides by 3.3x/3=15/3.x=5.then check answer by substituting 5 in x above.5^2-2(5)-15=025-10-15=0 answer is correct.