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stepladder [879]
4 years ago
7

Solve the equation using the quadratic formula. x^2 + 2x - 3

Mathematics
2 answers:
irinina [24]4 years ago
5 0

x²+2x-3

x²+3x-x-3

x(x+3)-1(x+3)

(x+3)(x-1)

x=-3,1

solniwko [45]4 years ago
4 0

Answer:

Step-by-step explanation:

The given quadratic equation is expressed as

x² + 2x - 3 = 0

The equation is already in the standard form of ax² + bx + c

The general formula for solving quadratic equations is expressed as

x = [- b ± √(b² - 4ac)]/2a

From the equation given,

a = 1

b = 2

c = - 3

Therefore,

x = [- 2 ± √(2² - 4 × 1 × - 3)]/2 × 1

x = [- 2 ± √(4 - - 12)]/2

x = [- 2 ± √16]/2

x = (- 2 + 4)/2 or x = (- 2 - 4)/2

x = 2/2 or x = - 6/2

x = 1 or x = - 3

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charle [14.2K]

Answer:

x = 20 but see below.

Step-by-step explanation:

Remark.

This is not well enough marked to know whether D = A or whether you have to do some algebra to find the relationship between A and D. So I will assume A = D and then I'll solve it so you have to manipulate A and D.

A = D

3x - 10 = 2x + 10                     Add 10 to both sides

3x - 10 + 10 = 2x + 10 + 10     Cancel

3x = 2x + 20                           Subtract 2x from both sides

3x-2x=2x-2x + 20

x = 20

A = E

If A = E then to find x you have to add 3 angles together.

E + D + 45 = 180                  Add the three angles of the triangle

E + D = 180 - 45                  Subtract  45 from both sides

E + D = 135                          Substitute for D and E

3x - 10 + 2x + 10 = 135        Combine like terms

5x = 135                              Divide by 5

x = 135 / 5

x = 27

Answer

I'd go with the first one.

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Step-by-step explanation:

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Step-by-step explanation:

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