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3 years ago

Find the value of x. (5x+15) (6x-10)

Mathematics

2 answers:

Annette [7]3 years ago

7 0

Answer:

We get x = -5/3 and x = -3

Step-by-step explanation:

$(5x+15) (6x-10)$

Multiplying this and equating to zero, to find x.

$30x^{2} -50x+90x-150=0$

$30x^{2} +40x-150=0$

Factoring out 10.

$3x^{2} +4x-15=0$

$3x^{2} +9x-5x-15=0$

3x(x+3)-5(x+3)=0 $[tex](3x-5)(x+3)=0$ [/tex]

We get x = -5/3 and x = -3

Blizzard [7]3 years ago

4 0

(5x+15)(6x-10)
= 30x^2 + 30x - 50x - 150
= 30x^2 - 20x - 150

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3 years ago

Read 2 more answers

I need help SHOW YOUR WORK

earnstyle [38]

Answer:

$F)\displaystyle \: 100\pi{ x}^{8} {y}^{2} {z}^{ 6}$

Step-by-step explanation:

we are given r and the formula

we want to find the surface area of the shpare with the given r

to do so

we need our algebra skills

substitute the value of r:

$\displaystyle \: S = 4\pi( {5x}^{4} y {z}^{ 3} {)}^{2}$

recall law of exponent

$\displaystyle \: ({x}^{m} {)}^{n} \iff \: {x}^{mn}$

to simplify:

$\displaystyle \: S = 4\pi({ {5}^{2} x}^{4 \times 2} {y}^{1 \times 2} {z}^{ 3 \times 2} )$

simplify multiplication:

$\displaystyle \: S = 4\pi({ 25x}^{8} {y}^{2} {z}^{ 6} )$

distribute:

$\displaystyle \: S = 100\pi{ x}^{8} {y}^{2} {z}^{ 6}$

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Step-by-step explanation:

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3 years ago