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3 years ago

Simplify the expression -4x^2(3x − 7).

Mathematics

2 answers:

satela [25.4K]3 years ago

5 0

Answer:

Step-by-step explanation:

Simplify the expression -4x^2(3x − 7).

A. -12x^3 + 28

C. -12x^3 − 28

D. -12x^3 − 28x^2

Ksivusya [100]3 years ago

4 0

Answer:

B) -12x³ + 28 x².Step-by-step explanation:

Given : -4x²(3x − 7).

To find : Simplify the expression

Solution : We have given that

-4x²(3x − 7).

Distribute -4x² over 3x − 7.

-4x² (3x) - -4x²( 7).

-12x³ + 28 x².

Therefore, B) -12x³ + 28 x².

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3 years ago

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3 years ago

21. 2n= 53 <br><br> Explanation of the division please, and how you got the answer

Ksju [112]

Answer:

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3 years ago

−k−(−8k+7) what is the answer, I want an explanation please

lord [1]

Answer:

Step-by-step explanation:

-k - ( -8k + 7)

negative sign is outside the parenthesis. so it should be multiplied with -8k and 7

-k - (-8k + 7) = -k - 8k * (-1) + 7*(-1)

= -1k + 8k - 7

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4 0

3 years ago

Lisa has 12 more stickers than John, and together they have 60 stickers. What is the ratio of the number of Lisa’s stickers to t

Harman [31]

Answer:

The ratio of the number of Lisa’s stickers to the number of John’s stickers is 3/2

Step-by-step explanation:

Step 1

Let

x ----> the number of stickers that Lisa has

y ----> the number of stickers that John has

we know that

$x+y=60$ ------> equation A

$x=y+12$ ----> equation B

Solve the system by substitution

Substitute equation B in equation A and solve for y

$(y+12)+y=60\\ 2y=60-12\\ 2y=48\\ y=24$

Find the value of x

$x=y+12$ -----> $x=24+12=36$

therefore

Lisa has 36 stickers and John has 24 stickers

Step 2

Find the ratio of the number of Lisa’s stickers to the number of John’s stickers

x/y

substitute

$\frac{36}{24}=\frac{3}{2}$

5 0

3 years ago