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3 years ago

Please help me it's one question but I have no idea how to do it!

Mathematics

1 answer:

harina [27]3 years ago

3 0

Answer:

roast beef=$6 per sandwich

ham=$5 per sandwich

Step-by-step explanation:

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What is the solution to (-14)^-2?<br>

GREYUIT [131]

Answer:

1/196

Step-by-step explanation:

$(-14)^-^2$
$\frac{1}{(-14)*(-14)}$

$\frac{1}{(-14)^2}$
$\frac{1}{196}$

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3 years ago

PLEASE HELP I'M BEING TIMED!!!!

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What is the range of this function?*

Mamont248 [21]

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Hey there!

The range of this function is all numbers to three.

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3 years ago

What are the correct answers and why? Simple and concise explanation please!!!

dezoksy [38]

Answer:

$\large\boxed{-\bigg[(x-3)^2+2x\bigg]+1}\\\\\boxed{-x^2+4x-8}$

Step-by-step explanation:

$(g\ \circ\ f)(x)=g\bigg(f(x)\bigg)$

$f(x)=(x-3)^2+2x\\\\g(x)=-x+1\\\\g\ \circ\ f\to\text{put f(x) instead of x in the function g(x)}:\\\\(g\ \circ\ f)(x)=-\bigg[\underbrace{(x-3)^2+2x}_{x}\bigg]+1$

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$-\bigg[(x-3)^2+2x\bigg]+1=-(x-3)^2-2x+1\\\\\text{use}\ (a-b)^2=a^2-2ab+b^2\\\\=-(x^2-(2)(x)(3)+3^2)-2x+1=-(x^2-6x+9)-2x+1\\\\=-x^2-(-6x)-9-2x+1=-x^2+6x-9-2x+1\\\\\text{combine like terms}\\\\=-x^2+(6x-2x)+(-9+1)=-x^2+4x-8$

-----------------------------------

$-x^2+4x-8=-x^2+4x-2^2+2^2-8=-(x^2-4x+2^2)+4-8\\\\=-(\underbrace{x^2-(2)(x)(2)+2^2}_{(a-b)^2=a^2-2ab+b^2})-4=-(x-2)^2-4=-(x+1-3)^2-4$

$In\ (-x+1-3)^2+2x,\ x^2\ will\ be\ positive.\\In\ (-x+1-3)^2+2(-x+1),\ x^2\ will\ be\ positive.$

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3 years ago

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