[tex]\frac{5-b}{3-a} - \frac{(4-b)(4+b)}{(a-3)^{2} } * \frac{3-a}{b-4} = \\= \frac{5-b}{3-a} - \frac{4+b}{a-3} = \frac{5-b}{3-a} + \frac{4+b}{3-a} = \frac{5-b+4+b}{3-a} = \frac{9}{3-a}[/tex]
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[tex]\frac{5-b}{3-a} - \frac{(4-b)(4+b)}{(a-3)^{2} } * \frac{3-a}{b-4} = \\= \frac{5-b}{3-a} - \frac{4+b}{a-3} = \frac{5-b}{3-a} + \frac{4+b}{3-a} = \frac{5-b+4+b}{3-a} = \frac{9}{3-a}[/tex]