Question

Oblicz wartości liczbowe wyrażeń:
a. x - 7y dla x = 3 i y = -2
b. 4[tex]a^{2}[/tex] - b(3a + 8) dla a = -3 i b = 4

Answer 1

a)

[tex]x - 7y = \\ \\ 3 - 7( - 2) = 17 \\ [/tex]

b)

[tex]4 {a}^{2} - b(3a + 8) = \\ \\ 4 {( - 3)}^{2} - 4(3 \times ( - 3) + 8) = \\ \\ 36 - 4( - 1) = \\ \\ 36 + 4 = 40 \\ [/tex]