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2 years ago

F(x) = 2x^2 – 5x; find f(3)

Mathematics

2 answers:

Reptile [31]2 years ago

8 0

Answer:

f(3)=3

Step-by-step explanation:

This question asks us to find f(3). We want to find what f(x), or y is, when x is equal to 3.

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

Substitute 3 in for x.

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

Solve according to PEMDAS: Parentheses, Exponents, Multiplication, Division, Addition, Subtraction

Evaluate the exponent first. 3^2 is the same as 3*3, which is equal to 9.

f(3)=2(9)-5(3)

Multiply 2 and 9

f(3)=18-5(3)

Multiply 5 and 3

f(3)=18-15

Subtract 15 from 18

f(3)=3

Nookie1986 [14]2 years ago

4 0

Answer:

f(3) = 3

Step-by-step explanation:

f(x) = 2x^2 – 5x

Let x = 3

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

= 2*9 -15

= 18-15

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slavikrds [6]

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3 years ago

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Amanda [17]

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2 years ago

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DaniilM [7]

The <em>correct answers</em> are:

5x²+70x+245 ≥ 1050; and

Yes.

Explanation:

Let x be the width of the tablet. Since the width of the TV is 7 inches more than the tablet, the width of the TV would be x+7.

The length of the TV is 5 times the width; this makes the length 5(x+7) = 5x+35.

The area of the TV would be given by

(x+7)(5x+35).

Since Andrew wants the area to be at least 1050, we set the expression greater than or equal to 1050:

(x+7)(5x+35) ≥ 1050

Multiplying this, we have:

x*5x+x*35+7*5x+7*35 ≥ 1050

5x²+35x+35x+245 ≥ 1050

Combining like terms,

5x²+70x+245 ≥ 1050

To see if 8 is a reasonable width for the tablet, we substitute 8 for x:

5(8²)+70(8)+245 ≥ 1050

5(64)+560+245 ≥ 1050

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2 years ago

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galina1969 [7]

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3 years ago

F(x) = 2x^2 – 5x; find f(3)​

F(x) = 2x^2 – 5x; find f(3)