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Otrada [13]
3 years ago
10

X^2+7x=-49 what is x?

Mathematics
1 answer:
Juliette [100K]3 years ago
8 0

Answer:

In x + 2 = 7, x is a variable, but we can work out its value

Step-by-step explanation:

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I WILL GIVE BRAINLIEST
krek1111 [17]

Answer: +42x

Step-by-step explanation:

The student only multiplied each term individually.

He should have (7x+3)² = (7x+3)(7x+3)

Which is 49x²+42x+9

Therefore the error is (42x) or the failure to apply the law of multiplication of variables in a bracket.

8 0
4 years ago
A set of symbols that expresses a mathematical rule is called a
Elenna [48]

Answer:

A set of symbols that expresses a mathematical rule or principle; for example, the formula for the area of a rectangle is a = lw, where a is the area, l the length, and w the width. The American Heritage® Student Science Dictionary, Second Edition.

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
2.<br>Remove the brackets and simplify <br>a) (x + 1) + (x + 2)?​
devlian [24]

Step-by-step explanation:

✲ \text{(x + 1) + (x + 2)}

Remove the unnecessary brackets :

⇢ \text{x + 1 + x + 2}

Combine like terms. Like terms are those which have the same base. Only coefficients of like terms can be added or subtracted.

⇢ \text{x + x + 1 + 2}

⇢ \text{2x + 3}

\red{ \boxed{ \boxed{ \text{Our \: final \: answer :  \boxed{ \underline{  \tt{2x + 3}}}}}}}

Hope I helped ! ♡

Have a wonderful day / night ! ツ

▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁

4 0
3 years ago
Read 2 more answers
-1/3 + (-7/4)<br> pls help
djverab [1.8K]

Answer:

  -25            

 ——— = -2.08333

    12  

Step-by-step explanation:

Step  1  :

           7

Simplify   —

           4

Equation at the end of step  1  :

       1           7

 (0 -  —) +  (0 -  —)

       3           4

Step  2  :

           1

Simplify   —

           3

Equation at the end of step  2  :

       1     -7

 (0 -  —) +  ——

       3     4

Step  3  :

Calculating the Least Common Multiple :

3.1    Find the Least Common Multiple

     The left denominator is :       3

     The right denominator is :       4

       Number of times each prime factor

       appears in the factorization of:

Prime

Factor   Left

Denominator   Right

Denominator   L.C.M = Max

{Left,Right}

3 1 0 1

2 0 2 2

Product of all

Prime Factors  3 4 12

     Least Common Multiple:

     12

Calculating Multipliers :

3.2    Calculate multipliers for the two fractions

   Denote the Least Common Multiple by  L.C.M

   Denote the Left Multiplier by  Left_M

   Denote the Right Multiplier by  Right_M

   Denote the Left Deniminator by  L_Deno

   Denote the Right Multiplier by  R_Deno

  Left_M = L.C.M / L_Deno = 4

  Right_M = L.C.M / R_Deno = 3

Making Equivalent Fractions :

3.3      Rewrite the two fractions into equivalent fractions

Two fractions are called equivalent if they have the same numeric value.

For example :  1/2   and  2/4  are equivalent,  y/(y+1)2   and  (y2+y)/(y+1)3  are equivalent as well.

To calculate equivalent fraction , multiply the Numerator of each fraction, by its respective Multiplier.

  L. Mult. • L. Num.      -1 • 4

  ——————————————————  =   ——————

        L.C.M               12  

  R. Mult. • R. Num.      -7 • 3

  ——————————————————  =   ——————

        L.C.M               12  

Adding fractions that have a common denominator :

3.4       Adding up the two equivalent fractions

Add the two equivalent fractions which now have a common denominator

Combine the numerators together, put the sum or difference over the common denominator then reduce to lowest terms if possible:

-1 • 4 + -7 • 3     -25

———————————————  =  ———

      12            12

Final result :

 -25            

 ——— = -2.08333

 12            

Processing ends successfully

plz mark me as brainliest :)

7 0
3 years ago
Read 2 more answers
What is the measure of a
Softa [21]

70º

It's a supplementary angle so 180º - 110º

3 0
3 years ago
Read 2 more answers
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