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Doss [256]
2 years ago
9

I need helpI need help​

Mathematics
1 answer:
Lera25 [3.4K]2 years ago
3 0

Answer:

A

Step-by-step explanation:

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(4x + 4)(ax – 1) – x2 +4
Oksana_A [137]

Answer:

b=-3

Step-by-step explanation:

If the expression simplifies to bx that means the x^{2} terms and the constant terms must be cancel out.

Simplify it first.

(4x+4)(ax-1)-x^{2} +4\\=(4ax^{2} -4x+4ax-4)-x^{2} +4\\=4ax^{2} -x^{2} -4x+4ax-4+4\\=4ax^{2} -x^{2} -4x+4ax

We know –4 + 4 will cancel out. If we simplify this expression to only an x term, then the x^{2} terms should be cancelled. Therefore, we say that 4ax^2 – x^2 = 0.

4ax^{2} -x^{2} =0\\x^{2} (4a-1)=0\\4a-1=0\\4a=1\\a=\frac{1}{4}

If we put a = ¼, then we can find the value of b:

=4(\frac{1}{4} )x^{2} -x^{2} -4x+4(\frac{1}{4} )x\\=x^{2} -x^{2} -4x+x\\ (cancel out x^{2} terms)\\

=-3x

bx=-3x\\      if the  expression is equivalent to bx

Therefore, b = –3.

8 0
3 years ago
<img src="https://tex.z-dn.net/?f=%20%5Cfrac%7B4x%20-%201%7D%7B2%7D%20%20%3D%20x%20%2B%207%20%5C%5C%20" id="TexFormula1" title="
AlekseyPX

Answer:

x=\frac{15}{2}=7.5

Step-by-step explanation:

See image.

8 0
3 years ago
Find the area please :)
Delicious77 [7]

Answer:

it's area is 1/2 b×h

1/2×7×3.8

13.3

4 0
3 years ago
Read 2 more answers
Please give answer ofHCF of 15 and 18​
lana66690 [7]

Answer: The prime factorization of 15 is: 3 x 5. The prime factorization of 18 is: 2 x 3 x 3. The prime factors and multiplicities 15 and 18 have in common are: 3. 3 is the gcf of 15 and 18.

Step-by-step explanation:

6 0
3 years ago
What is the average rate of change of the function f(x)=4(2)^x from x = 0 to x = 2? Enter your answer in the box.
bekas [8.4K]

average rate of change is just the slope from (0,f(0)) to (2,f(2))


basically, average rate of change=slope=\frac{f(2)-f(0)}{2-0}

evalaute each

f(2)=4(2)^2=4(4)=16

f(0)=4(2)^0=4(1)=4


so average rate of change=\frac{16-4}{2-0}=\fracc{12}{2}=6

average rate of change is 6

3 0
3 years ago
Read 2 more answers
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