ANSWER:
- -5
Solution:
1.Substitute
- Substitute x = 4 into [tex] \sf{ - \frac{1}{2} {x}^{2} + \frac{3}{4} \times }[/tex]
- [tex] \sf{ - \frac{ {4}^{2} }{2} + 4 \times \frac{3}{4} }[/tex]
2.Calculate
- [tex] \sf{ - \frac{16}{2} + 4 \times \frac{3}{4} }[/tex]
- Cross out the common factor
- [tex] \sf{ - 8 + 4 \times \frac{3}{4} }[/tex]
- Cross out common factor
- [tex] \sf{ - 8 + 3}[/tex]
- Calculate the sum or difference
- -5
Hope it helps