Question

If x = - 1, evaluate the following:
3x^2 - x +7

Answer 1

putting the value of x =(-1) .Then,


$= 3 {x}^{2} - x + 7 \\ \\ = 3 ({ - 1}^{2} ) - ( - 1) + 7 \\ \\ = 3 \times 1 + 1 + 7 \\ \\ = 3 + 1 + 7 \\ \\ = 11$

Answer 2

given X = -1


let y = 3x²-x+7

put value of X

y = 3(-1)²-(-1)+7

y= 3+1+7

y =11