Question

find the value of the polinomial 3x^2+2x -1 at a ) x=0. b ) x = -1​

Answer 1

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Answer 2

Answer:

$3 {x}^{2} + 2x - 1 \\ putting \: x = 0 \\ = 3 \times {0}^{2} + 2 \times 0 - 1 \\ = 3 \times 0 + 0 - 1 \\ = 0 + 0 - 1 \\ = - 1 \\ now \: putting \: x = - 1 \\ 3 {x }^{2} + 2x - 1 \\ = 3 \times { (- 1)}^{2} + 2 \times ( - 1) - 1 \\ = 3 \times 1 + ( - 2) - 1 \\ = 3 - 2 - 1 \\ = 1 - 1 \\ = 0$