2 years ago

Factor the expression: 5x^3 + 10x^2 + 15x

1 answer:

Ber [7]2 years ago

3 0

5x (x^2 + 2x +3) i think

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liubo4ka [24]

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hi there the answer is 72

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sorry but my work is on a piece of paper in front of me

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kvasek [131]

Among many other formulas, the area of a triangle is

$S = \frac 1 2 a c \sin B$

where B is the angle between sides a and c.

$S=\frac 1 2(10)(20) \sin 67^\circ \approx 92.05 \textrm{ sq cm}$

Answer: 92.05 sq cm, first choice

Bonus. Here's a formula for the area S of a triangle your teacher doesn't know:

$16S^2 = 4a^2b^2 -(c^2-a^2-b^2)^2=(a^2+b^2+c^2)^2-2(a^4+b^4+c^4)$

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Mandarinka [93]

We set up the equation 580/4 = 725/x. Since we know these are proportional, we can cross-multiply and solve to get x = 5.

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2 years ago