If y2 + ky + b = (y − z)(y + q), then what is b, in terms of q and z?

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If <em>y</em><sup>2</sup> + <em>ky</em> + <em>b</em> = (<em>y</em> − <em>z</em>)(<em>y</em> + <em>q</em>), then what is <em>b</em>, in terms of <em>q</em> and <em>z</em>?