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Karo-lina-s [1.5K]
3 years ago
9

Factor over complex number y^4+12y^2+36

Mathematics
1 answer:
sladkih [1.3K]3 years ago
3 0
((y^4) +  (2^2*3y^2)) +  36 \\ \\   Factoring \  y^4+12y^2+36 \\ \\      y^4 + 6y^2 + 6y^2 + 36 \\ \\     y^2 * (y^2+6) \\ \\    6 * (y^2+6) \\ \\  (y^2+6)  *  (y^2+6) \\ \\ Multiply \  (y^2+6) \  by \  (y 62+6) \\ \\ YOUR \ ANSWER: \ \boxed{  (y^2 + 6)^2}



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In a GP, the sixth term is eight times the tenth term. The sum of the seventh and the eighth term is 192. Find the common ratio
liubo4ka [24]

Let <em>a</em>(<em>n</em>) denote the <em>n</em>-th term in the GP. We're given

<em>a</em>(6) = 8<em>a</em>(10)

<em>a</em>(7) + <em>a</em>(8) = 192

In a geometric progression, consecutive terms are scaled up or down by a fixed ratio <em>r</em> such that

<em>a</em>(<em>n</em>) = <em>r</em> <em>a</em>(<em>n</em> - 1)

By substitution, we get

<em>a</em>(<em>n</em>) = <em>r</em> (<em>r</em> <em>a</em>(<em>n</em> - 2)) = <em>r</em> ² <em>a</em>(<em>n</em> - 2)

and we can continue the pattern down to the first term,

<em>a</em>(<em>n</em>) = <em>r</em> <em>a</em>(<em>n</em> - 1) = <em>r</em> ² <em>a</em>(<em>n</em> - 2) = <em>r</em> ³ <em>a</em>(<em>n</em> - 3) = … = <em>rⁿ </em>⁻¹ <em>a</em>(1)

So we can rewrite the first two equations in terms of the first term of the GP <em>a</em>(1) and the common ratio <em>r</em> :

<em>r</em> ⁵ <em>a</em>(1) = 8<em>r</em> ⁹ <em>a</em>(1)

<em>r</em> ⁶ <em>a</em>(1) + <em>r</em> ⁷ <em>a</em>(1) = 192

Solve the first equation for <em>r</em> :

<em>r</em> ⁵ <em>a</em>(1) = 8<em>r</em> ⁹ <em>a</em>(1)   →   1 = 8<em>r</em> ⁴   →   <em>r</em> = 1/∜8 ≈ 0.5946

Solve the second equation for <em>a</em>(1) :

<em>r</em> ⁶ <em>a</em>(1) + <em>r</em> ⁷ <em>a</em>(1) = <em>r</em> ⁶ <em>a</em>(1) (1 + <em>r</em> ) = 1/(16√2) <em>a</em>(1) (1 + 1/∜8) = 192

→   <em>a</em>(1) = 6144 ∜2 / (1 + ∜8) ≈ 2724.48

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