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Evaluate -1/2 x² + 3/4 x for x = 4.
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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
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