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2 years ago

What is 15(2x – 3y + 5x) = ?

Mathematics

1 answer:

bekas [8.4K]2 years ago

6 0

Answer: 105x + -45y

Step-by-step explanation: Since there are three terms inside the parentheses in this problem, the 15 distributes through all three terms.

Before distributing however, change the -3y to plus a negative 3y.

So we have 15(2x) + 15(-3y) + 15(5x).

This simplifies to 30x + -45y + 75x.

Now combine like terms to get 105x + -45y.

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2 years ago

Solve the equation. x2 18x 81 = 25<br> a. 14, 4<br> b. –4, –14<br> c. 14, –14<br> d. –4, 4

Snowcat [4.5K]

Answer:

The answer is the option B

$-4,-14$

Step-by-step explanation:

we know that

The formula to solve a quadratic equation of the form $ax^{2} +bx+c=0$ is equal to

$x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$x^{2}+18x+81=25$

$x^{2}+18x+56=0$

$a=1\\b=18\\c=56$

substitute in the formula

$x=\frac{-18(+/-)\sqrt{18^{2}-4(1)(56)}} {2(1)}$

$x=\frac{-18(+/-)\sqrt{100}} {2}$

$x=\frac{-18(+/-)10} {2}$

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3 years ago

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Vikki [24]

Answer:

linear pair

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