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3 years ago

What is f(4) = 4x^2 - x

Mathematics

2 answers:

Andrej [43]3 years ago

7 0

Answer:

Step-by-step explanation:

Substitute the given value into the function and evaluate.

the x=4

4(4)^2-4

4*4=16

(4)16-4=64

64-4

Hope this helps!! Please consider marking brainliest! Have a good one!!

Paul [167]3 years ago

6 0

Answer:

Step-by-step explanation:

first plug in 4 for x

4(4)^2 - 4

then square the 4 in the parenthesis

4(16) - 4

then multiply 4x16

64 - 4

finally simplify to get the answer

64 - 4 = 60

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Work out 140-3^2×(8+4)+6÷2

kiruha [24]

Answer:

140 - 9 (12) + 3

140 - 108 +3

140 - 111

= 29

4 0

2 years ago

HELLPPPPPPPPPPP PLEASE

KiRa [710]

Alright, so we plug (-2) in for x. (-2)^2 =4, and we can plug that in as 4(4)+(-2)+5. Next, 4*4=16, so we get 15+(-2)+5. After that, we get 15-2+5=18

3 0

3 years ago

Complete the square than convert to vertex form. y=2x^2+8x-9

8_murik_8 [283]

$y=2x^2+8x-9\\D=b^2-4ac\\D=64-4(2)(-9)\\D=64+72 > 0$

There are 2 roots so the only way to complete the square is,

$y=2x^2+8x-9\\y=2[(x^2+4x)]-9\\y=2[(x^2+4x+4)-4]-9\\y=2[(x+2)^2-4]-9\\y=2(x+2)^2-8-9\\y=2(x+2)^2-17$

Just factor 2 out of 2x^2+8x (just ignore the -9) then find the number that will make the terms be able to complete the square.

then complete the square and multiply 2 inside the brackets.

subtraction as you already get the vertex form and know how to complete the square.

Vertex Form: $y=2(x+2)^2-17$

3 0

3 years ago

7th grade math help me pleaseeee

garik1379 [7]

The answer to how many batches is 9, hope this helped.

4 0

2 years ago

The temperature on the ground during a plane's takeoff was 4*F. At 38,000 feet in the air, the temperature outside the plane was

Finger [1]

Answer:

-22*F

Step-by-step explanation:

The answer is -22*F because you are subtracting -7*F from -29*F.

7 0

2 years ago

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