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erma4kov [3.2K]
1 year ago
8

Simplify. final answer should be written in standard form (a+b)(3a-b)(2a+7b)

Mathematics
1 answer:
algol131 year ago
6 0

we have

(a+b)(3a-b)(2a+7b)

step 1

Solve

apply distributive property

(a+b)(3a-b)=3a^2-ab-3ab-b^2=3a^2-4ab-b^2

step 2

Multiply (3a^2-4ab-b^2) by (2a+7b)

6a^3+21a^2b-8a^2b-28ab^2-2ab^2-7b^3=6a^3+13a^2b-30ab^2-7b^3

answer is

<h2>6a^3+13a^2b-30ab^2-7b^3</h2>
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Evaluate, when x=2 y=-5 and z=3
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Answer:

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Step-by-step explanation:

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(4 x^3 - 2 y - 2 z^3)/4 y^2 - 16 x^2 = (4×2^3 - -5×2 - 2×3^3)/4×(-5)^2 - 16×2^2

(4×2^3 - 2 (-5) - 2×3^3)/4×(-5)^2 = ((4×2^3 - 2 (-5) - 2×3^3) (-5)^2)/4:

((4×2^3 - 2 (-5) - 2×3^3) (-5)^2)/4 - 16×2^2

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2^3 = 2×2^2:

((4×2×2^2 - 2 (-5) - 2×3^3) 25)/4 - 16×2^2

2^2 = 4:

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| 3 | 2

+ | 1 | 0

| 4 | 2:

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42 - 54 = -(54 - 42):

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| 5 | 4

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| 7 | 5

+ | 6 | 4

1 | 3 | 9:

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