Question

How do you find the value of f(-5) for the function

f(x)=3x^2-2x+5

Answer 1

To find the value of f(-5) for the given function , we just need to put the value of x ( which is -5) in the given function. Let's do it!

`\purple{\frak{\implies f(x) = 3x^2-2x+5}} \\`

`\sf \implies f(-5) = 3 * (-5)^2 - 2(-5) + 5 \\`

`\sf \implies f(-5) = 3 * (-5)^2 - 2(-5) + 5 \\`

`\sf \implies f(-5) = (3* 25) +10 + 5 \\`

`\sf \implies f(-5) = 75 + 10+5\\`

`\purple{\frak{ \implies f(-5) = 90} }\\`

• Henceforth, the value of the function is 90.

Answer 2

Answer: 90

Explanation:

f(x) = 3x^2-2x+5

f(-5) = 3 x (-5)^2 - 2(-5) + 5

f(-5) = 3 x (-5)^2 - 2(-5) + 5

f(-5) = (3x25) +10 + 5

f(-5) = 75 + 15

f(-5) = 90