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OpenStudy (anonymous):
If the expression x^2 + bx - 15 has a factor of (x - 3), what is the value of b?
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TheSmartOne (thesmartone):
So (x-3)(x+_)=x^2+bx-15 So -3 * what=-15
TheSmartOne (thesmartone):
And then to find b you just add -3 and the number you found out that multiplies with -3 and equals to -15
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