Question

what should be tha value of a if the value of 2x² + x - a is equals to 5 when x = -4


plz answer fast
first answer will be brain list​

Answer 1

Step-by-step explanation:

Given X= -4

substituting the value

${2x}^{2} + x - a = 5 \\ 2 \times {( - 4)}^{2} + ( - 4) - a = 5 \\ 2 \times 16 - 4 - a = 5 \\ 32 - 4 - a = 5 \\ 28 - a = 5 \\ a = 28 - 5 \\ 23 \\ check \\ 2 {x}^{2} + x - a = 5 \\ 2 {( - 4)}^{2} + ( - 4) - 23 = 5 \\ 32 - 4 - 23 = 5 \\ 32 - 27 = 5 \\ 5 = 5 \\ lhs = rhs$

hence verified

Answer 2

Answer:

Value of a is 23. I tried my best but no confirm .