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Len [333]
3 years ago
7

What is -7 to the second power

Mathematics
2 answers:
Paha777 [63]3 years ago
8 0

Answer:

+49

Step-by-step explanation:

-7 x -7 = +49 because the negatives cancel out, resulting in a positive

valkas [14]3 years ago
3 0

Answer:

49

Step-by-step explanation:

-7 multiplied by -7 would be 49

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Which binomial is a factor of 49x^2+84xy+36y^2
sweet-ann [11.9K]

7x + 6y is a binomial that is a factor of given equation

<em><u>Solution:</u></em>

A binomial is a mathematical expression which has only two terms

<em><u>Given expression is:</u></em>

49x^2 + 84xy + 36y^2

We have to find the binomial that is a factor to given expression

Let us find the factors of given equation

49x^2+84xy+36y^2\\\\\mathrm{Rewrite\:}49x^2+84xy+36y^2\mathrm{\:as\:}\left(7x\right)^2+2\cdot \:7x\cdot \:6y+\left(6y\right)^2\\\\\mathrm{Rewrite\:}49\mathrm{\:as\:}7^2\\\\7^2x^2+84xy+36y^2\\\\\mathrm{Rewrite\:}36\mathrm{\:as\:}6^2\\\\7^2x^2+84xy+6^2y^2\\\\\mathrm{Apply\:exponent\:rule}:\quad \:a^mb^m=\left(ab\right)^m\\\\7^2x^2=\left(7x\right)^2\\\\Therefore,\\\\\left(7x\right)^2+84xy+6^2y^2\\\\\mathrm{Apply\:exponent\:rule}:\quad \:a^mb^m=\left(ab\right)^m\\\\6^2y^2=\left(6y\right)^2\\\\

Therefore\\\\\left(7x\right)^2+84xy+\left(6y\right)^2\\\\\mathrm{Rewrite\:}84xy\mathrm{\:as\:}2\cdot \:7x\cdot \:6y\\\\\left(7x\right)^2+2\cdot \:7x\cdot \:6y+\left(6y\right)^2\\\\\left(7x\right)^2+2\cdot \:7x\cdot \:6y+\left(6y\right)^2\\\\

\mathrm{Apply\:Perfect\:Square\:Formula}:\quad \left(a+b\right)^2=a^2+2ab+b^2\\\\a=7x,\:b=6y\\\\Therefore,\\\\\left(7x\right)^2+2\cdot \:7x\cdot \:6y+\left(6y\right)^2 = \left(7x+6y\right)^2

Thus we get,

49x^2 + 84xy + 36y^2 = (7x+6y)^2\\\\49x^2 + 84xy + 36y^2 =  (7x+6y)(7x+6y)

Thus the binomial which is a factor is 7x + 6y

6 0
3 years ago
If bookshelf A is 6 feet long and bookshelf B is 8 feet long, what is the length of bookshelf C?
Sliva [168]

Answer:

3.5 feet = 3 feet 6 inches

3 * 12 = 36

36 + 6 = 42 inches long

42 / 5/8 → 42 * 8/5 = 42*8/5

336 / 5 = 67.2

We can't put up part of a book, so we can fit 67 books.

Step-by-step explanation:

3 0
2 years ago
Solve for x. A) 3.0 B) 3.25 C) 3.5 D) 3.75
IceJOKER [234]

Answer:  D) 3.75

Step-by-step explanation:

According to the Insersecting chords theorem, when you multiply the lengths of the segments of one of the chords in a circle, the product obtained is equal to the product of the segments of the other chord.

Based on this, you can find the value of "x" with:

(5)(3)=(4)(x)\\15=4x

Solve for "x" (Applying the Division property of equality, you can divide both sides of the equation by 4). Then:

\frac{15}{4}=\frac{4x}{4}\\\\x=\frac{15}{4}\\\\x=3.75

This value matches with the option D.

5 0
3 years ago
(7.2x10^-4)(8.0x10^-5
d1i1m1o1n [39]

Answer:

5.76e-8

Step-by-step explanation:

(7.2x10^-4)(8.0x10^-5)

5.76e-8

3 0
2 years ago
What is the ratio of the volume of a cube with edge length six inches to the volume of a cube with edge length one foot? Express
gladu [14]

Answer:

The ratio is \frac{1}{8}

Step-by-step explanation:

The volume of a cube with edge length a is:

V = a^{3}

We have two cubes:

Cube 1: The one with edge length of six inches.

Cubs 2: The one with edge length of one foot.

The ratio is:

R = \frac{V_{C1}}{V_{C2}}

In which V_{C1} is the volume of the first cube and V_{C2} is the volume of the second cube.

Volume of the first cube

The edge length is 6 inches, so a = 6.

V_{C1} = 6^{3} = 216 inches^{3}

Volume of the second cube

To express the ratio as a common fraction, both volumes must be in the same unit. So we must pass the edge length of the second cube to inches.

The second cube has edge length of one foot. Each foot has twelve inches. So

V_{C2} = 12^{3} = 1720 inches^{3}

Ratio:

R = \frac{V_{C1}}{V_{C2}} = \frac{216}{1720} = \frac{1}{8}

3 0
3 years ago
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