Question

simplify and evaluate the expression 3z - 2z (z) + 4z - 10z (z) + 12z (z) when z= 10 and z= -10.
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Answer 1

Answer:

$(3z - 2z)z + (4z - 10z)z + (12z)z \\ z = 10 \\ = > {z}^{2} - {6z}^{2} + 12 {z}^{2} \\ = > 10 \times 10 - 6 \times 10 \times 10 + 12 \times 10 \times 10\\ = > 100 - 600 + 1200 \\ = > - 500 + 1200 \\ = > 700$

$z = - 10 \\ = > {z}^{2} - 6 {z}^{2} + 12 {z}^{2} \\ = > ( - 10 \times - 10 ) + (- 6 \times - 10 \times - 10) + ( + 12 \times - 10 \times - 10) \\ = > 100 - 600 + 1200 \\ = > - 500 + 1200 \\ = > 700$