Question

ix IF F(x) = 2x² +3x-1 , then F (-1)?​

Answer 1

Answer:

F(x) = 2x^2 +3x -1

F(-1) = 2(-1)^2 + 3(-1) -1

F(-1) = 2 -3 - 1

F(-1) = 2 - 4

F(-1) = - 2

Answer 2

Answer:

These type of problems are usually solved by substituting the values inside the bracket to arrive at the final answer. The statement f ( A ) is read as the value of function when x takes the value A.

E.g. f(x) = 2x² + 3x - 1

⇒ f(A) = 2 ( A )² + 3 ( A ) - 1

⇒ f(A) = 2A² + 3A - 1

Coming to the question,

Given: f(x) = 2x² + 3x - 1

Hence f(-1) would be given as:

⇒ 2 ( -1 )² + 3 ( -1 ) - 1

⇒ 2 ( 1 ) - 3 - 1

⇒ 2 - 4

⇒ -2

Hence the answer is -2.