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3 years ago

Simplify: x(x-2)-3x(2x-1)

Mathematics

2 answers:

n200080 [17]3 years ago

6 0

Answer:

x^2-2x-6x^2+3x

x^2+x-6x^2

-5x^2+x

julsineya [31]3 years ago

4 0

Answer:

-5x^2 +x

Step-by-step explanation:

x(x-2)-3x(2x-1)

Distribute

x^2 -2x -6x^2 +3x

Combine like terms

-5x^2 +x

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Simplify: (x + 7)(x-4) A. 2r +3 B. 12-28 C. x2-3x - 28 D. x2 + 3x - 28

jeka57 [31]

Answer:

(x + 7)(x - 4) = x2 - 4x + 7x - 28 = x2 + 3x - 28

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3 years ago

Prove that if one solution for a quadratic equation of theform x2 + bx + c = 0 is rational (where b and c are rational),then the

Elenna [48]

Answer:

The other solution of the given equation x² + bx + c = 0 is also rational number.

Step-by-step explanation:

Here, given: ax² + bx + c = 0 is a quadratic equation

Also, one solution (r) of equation is RATIONAL.

To show: The other solution (s) is also RATIONAL

Now, here: as x² + bx + c = 0

Since r and s are the two given solutions, the given equation can be factorized as:

x² + bx + c = (x -r) (x - s)

Simplifying LHS, we get:

(x -r) (x - s) = x x - r (x) - s (x) + (r)(s)

= x² + x(-r - s) + rs

or, x² + bx + c = x² + x(-r - s) + rs

Comparing the related terms, we get:

b = (-r - s)

⇒ b + s = - r

or, s = -r - b

Now, given : r = Rational and the negative of a rational is also rational.

⇒ -r is also rational

Also, difference of two rational number is also rational.

⇒ -r - b is also rational

⇒ s is a RATIONAL NUMBER

Hence, the other solution of the given equation x² + bx + c = 0 is also rational number.

7 0

4 years ago

HELP i dont understand this.

Talja [164]

Answer:

Step-by-step explanation:

a) is SAS (side , angle, side)

b) is SSA ( side , side angle) and also :P recognize you can't say (Angle Side, Side ) or the teacher will send you to the office for cussing :P

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3 years ago

Evaluate 48×15^2-5^2×2×24 by using factorisation and algebraic identities.

nikklg [1K]

Step-by-step explanation:

$9600$

This is your answer

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3 years ago

DRAW AN AREA MODEL WITH THIS EQUATION PEOPLE LITERALLY JUST SOLVE THE MULTIPICATION

Iteru [2.4K]

Answer:

You need four squares.

On the top left square, you put the number 20 over it, and the number 30 to its left. Put the number 600 in the square.

Next, the bottom left square. But the number 4 on the left side of the square, and put the number 80 in the square.

Now, the top right box. put the number 8 over it, and fill it with the number 240.

Last, fill the bottom right square with the number 32.

7 0

3 years ago

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