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lora16 [44]
3 years ago
13

Which is equivalent to (9y2 – 4x)(9y2 + 4x), and what type of special product is it?

Mathematics
1 answer:
QveST [7]3 years ago
7 0
This is an example of the difference of squares.

a^2 - b^2 = (a-b)(a+b)

So to find the product of <span>(9y</span>²<span> – 4x)(9y</span>²<span> + 4x), we use the formula for the difference of squares.

</span>(9y^2 - 4x)(9y^2 + 4x)\\\\=(9y^2)^2 -(4x)^2\\\\=\boxed{\bf{81y^4 - 16x^2}}<span>
</span>
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Find the numbers a, b and c if the polynomial x3−18x2+24xb−c is the cube of the binomial x+2a.
mojhsa [17]

Answer:

a=-3\\ \\b=\dfrac{9}{2}\\ \\c=216

Step-by-step explanation:

Use formula

(u+v)^3=u^3+3u^2v+3uv^2+v^3.

Hence,

(x+2a)^3=x^3+3x^2\cdot 2a+3x\cdot (2a)^2+(2a)^3=x^3+6ax^2+12a^2x+8a^3.

This expression is equal to

x^3-18x^2+24bx-c,

so we can equate the coefficients at powers of x:

x^3:\ 1=1\\ \\x^2:\ 6a=-18\Rightarrow a=-3\\ \\x:\ 12a^2=24b\Rightarrow b=\dfrac{9}{2}\\ \\1=x^0:\ 8a^3=-c\Rightarrow c=-8\cdot (-3)^3=216.

6 0
3 years ago
Evaluate the expression
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Answer:

15

Step-by-step explanation:

substitute the values that are given into the expression.

c + a = x

12 + 3 = x

15 = x

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3 years ago
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Answer:

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x(x - 32) = 0

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