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2 years ago

Solve the following equation: 7x– 9=19

Mathematics

2 answers:

Gelneren [198K]2 years ago

4 0

Answer:

x=4

Step-by-step explanation:

7x - 9 = 19

add 9 to both sides

7x = 28

divide by 7

x = 4

Sladkaya [172]2 years ago

4 0

Answer:

$x=4$

Step-by-step explanation:

First, you take the equation and add 9 to both sides ( $7x-9+9=19+9$ ) which will cancel out the 9 on the left side, and add onto the 19 which would be 28.

Next, you simplify the answer of that to get $7x=28$

After you divide 7 from both sides ( $\frac{7x}{7}=\frac{28}{7}$ )

Finally, after solving that division problem you will get the answer of the equation which is $x=4$

Brainliest pls?

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F(x)={5−1 if 1≤x<7, if 7≤x≤13. Evaluate the definite integral by interpreting it as signed area.

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Answer:

\int\limits^7_1 {f(x)} \, dx =24

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Step-by-step explanation:

From Exercise we have f(x)=5-1 , we get f(x)=4.

We calculate integral, if 1≤x<7, we get

\int\limits^7_1 {f(x)} \, dx =\int\limits^7_1 {4} \, dx =4[x]\limits^7_1=4(7-1)=4·6=24

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\int\limits^13_7 {f(x)} \, dx =\int\limits^13_7 {4} \, dx =4[x]\limits^13_7=

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divide both sides of the equation by 2 to get:

(x + 1/4)^2 = -7/16 ***** this is your solution.

continue further to solve for x if you care to, but the problem did not require you to do this.

take the square root of both sides of the equation to get:

x + 1/4 = plus or minus sqrt(-7/16)

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since sqrt(-7/16) is the same as sqrt(7/16) * i, your solution becomes:

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the solution to that is:

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2 * (x^2 + x/2) = -1

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