Question

3 1) Determine o valor de y das expressões abaixo: a) y = 10 + x + 9 - 2x para x = 3 b) y = -x + 6 para x = 8 c) y = x2 - 4x - 3x + 8 para x = -1 d) y = x3 – 2x + 1 para x = -2 e)Z = (a - b)2-63+ a2 para a = 2 e b = -1 1) P = (a + b + c)a2 - 10a3 para a = b = c = -2​

Answer 1

$a) \begin{bmatrix}y=10+x+9-2x\\ x=3\end{bmatrix}\\\\y=10+3+9-2\cdot \:3\\\\y=16\\\\y=16,\:x=3$

$b) \begin{bmatrix}y=-x+6\\ x=8\end{bmatrix}\\\\\begin{bmatrix}x=8\end{bmatrix}\\\\y=-8+6\\\\y=-2\\\\y=-2,\:x=8$

$c) \begin{bmatrix}y=x\cdot \:2-4x-3x+8\\ x=-1\end{bmatrix}\\\\\begin{bmatrix}x=-1\end{bmatrix}\\\\y=\left(-1\right)\cdot \:2-4\left(-1\right)-3\left(-1\right)+8\\\\y=13\\\\y=13,\:x=-1$

$d) \begin{bmatrix}y=x\cdot \:3-2x+1\\ x=-2\end{bmatrix}\\\\\begin{bmatrix}x=-2\end{bmatrix}\\\\y=\left(-2\right)\cdot \:3-2\left(-2\right)+1\\\\y=-1\\\\y=-1,\:x=-2$

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