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kogti [31]
3 years ago
8

For each equation below find y if x=2

Mathematics
1 answer:
Nikolay [14]3 years ago
4 0
A - would be 7 - 2 = 5
B - would be 2 to the second - 1 = 3
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Solve 2x2 + x − 4 = 0. x2 + x + = 0
Ksenya-84 [330]

Answer:

The Quadratic Polynomial is

2 x² +x -4=0

Using the Determinant method to find the roots of this equation

x=\frac{-1\pm \sqrt{1^2-4*2*(-4)}}{2\times 2}\\\\ x=\frac{-1 \pm \sqrt{32}}{4}{\text{Using the formula}}x=\frac{-b\pm\sqrt{D}}{2a}, {\text{where}},D=b^2-4 ac

For, the Quadratic equation , ax²+ b x+c=0

(b) x²+x=0

x × (x+1)=0

x=0  ∧ x+1=0

x=0     ∧   x= -1

You can look the problem in other way

the two Quadratic polynomials are

2 x²+x-4=0, ∧ x²+x=0

x²= -x

So, 2 x²+x-4=0,

→ -2 x+x-4=0

→ -x -4=0

→x= -4

∨

x² +x² +x-4=0

x²+0-4=0→→x²+x=0

→x²=4

x=√4

x=2 ∧ x=-2

As, you will put these values into the equation, you will find that these values does not satisfy both the equations.

So, there is no solution.

You can solve these two equation graphically also.

3 0
4 years ago
Read 2 more answers
One year, the population of a city was 330,000. Several years later it was
goblinko [34]

Answer:

18%

Step-by-step explanation:

Express the ending population as a percentage of the starting population:

270000 divided by 330000=0.82

0.82 *100=82

subtract from the 100% we started with to get the percent decrease:

100% - 82% = 18

:)

8 0
3 years ago
Of 50 students surveyed, 19 owned a tablet, 42 owned a calculator, and 15 owned both. How many students owned a calculator but d
alekssr [168]

Answer:

27

Step-by-step explanation:

3 0
3 years ago
14. Select ALL the fractions that are equavialiant to 0.7
Dmitry_Shevchenko [17]
The answers are A and D
6 0
3 years ago
-2 + (-7) =<br> Help please
Goshia [24]

Answer:

That would be -5

Step-by-step explanation:

7 0
3 years ago
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