if f(x)=3x^3+Ax^2+5x-3 and f(2)=1, what is the value of A

Question

if f(x)=3x^3+Ax^2+5x-3 and f(2)=1, what is the value of A

simplify your answer

Answer 1

When they say f(2) = 1, they mean that when you plug in x = 2 into the function, the results will be 1.

So plug in x = 2 and set it equal to 1:

1 = 3(2)³ + A(2)² + 5(2) - 3

1 = 3(8) + A(4) + 10 - 3

1 = 24 + 4A + 7

1 = 31 + 4A

-30 = 4A

-30/4 = A

A = -7.5

Answer 2

1 = 3(2³) (2²)A + 5(2) - 1

Can you solve for A and answer?