Question

F(x) = 2x² + 3x - 5; f(-4)

f(-4)=

Answer 1

`\underline{ \underline{ \boxed{\huge \frak{ {\color{orange}{ \: Answer :✓ } }}}}}`

Given Function :

`\large {\color{lavender}↝ }\frak{\: \: \: \: \: \: f ( x ) = 2x² + 3x - 5}`

`\: \: \:`

Put x = -4 in given function :

`\: \:`

`\large {\color{lavender}↝ }\frak{\: \: \: \: \: \: f ( x ) = 2x² + 3x - 5}`

`\: \:`

`\large {\color{lavender}↝ }\frak{\: \: \: \: \: \: f ( - 4 ) = 2( \: - 4 \: )^(2) + 3 ( - 4) - 5}`

`\: \:`

`\large {\color{lavender}↝ }\frak{\: \: \: \: \: \: f ( - 4 ) =2( \: 16 \: ) + 3( - 4) - 5}`

`\: \:`

`\large {\color{lavender}↝ }\frak{\: \: \: \: \: \: f ( - 4 ) =32 - 12 - 5}`

`\: \:`

`\large {\color{lavender}↝ }\frak{\: \: \: \: \: \: f ( - 4 ) =20 - 5}`

`\: \: \:`

`\red{\underline{ \boxed{\large {\color{lavender}↝ }\frak{\: \: \: \: \: \: f ( - 4 ) = 15 \: ✓}}}}`

`\: \:`

Hope Helps!

Answer 2

15

Explanation:

Hello!

We can solve this question by plugging in -4 for x in the original expression, and simplifying.

Evaluate

• f(x) = 2x² + 3x - 5
• f(-4) = 2(-4)² + 3(-4) - 5
• f(-4) = 32 - 12 - 5

• f(-4) = 15

The value of the expression when x = -4 is 15.