Question

a ²-3a +5 -1/2 ( 3a²- 5a +7)​

Answer 1

Step-by-step explanation:

a ²-3a +5 -1/2 ( 3a²- 5a +7)

$= \frac{2a ²-6a +10 - ( 3a²- 5a +7)}{2} \\ = \frac{2a ²-6a +10 -3a² + 5a - 7)}{2} \\ = \frac{ - {a}^{2} - a + 3 }{2} \\ = \frac{ {a}^{2} + a - 3 }{2}$