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horsena [70]
3 years ago
15

Solve the quadratic equation by using either numeric or graphic approach x^2 + 2x - 3 = 0

Mathematics
2 answers:
fomenos3 years ago
8 0

Answer:

d

Step-by-step explanation:

x 1=  \frac{ - b +  \sqrt{ {b}^{2}  - 4ac} }{2a}  \\ x2 =  \frac{ - b  -   \sqrt{ {b}^{2} -  4ac} }{2a}  \\ x1 =  \frac{ - 2 +  \sqrt{ {2}^{2}  - 4\times 1 \times ( - 3)} }{2}  = 1 \\ x2 =   \frac{ - 2 -  \sqrt{ {2}^{2}  - 4 \times 1 \times ( - 3)} }{2}  =  - 3

ser-zykov [4K]3 years ago
7 0

Answer:

d

Step-by-step explanation:

Solving by factorising

Given

x² + 2x - 3 = 0 ← in standard form

(x + 3)(x - 1) = 0 ← in factored form

Equate each factor to zero and solve for x

x + 3 = 0 ⇒ x = - 3

x - 1 = 0 ⇒ x = 1

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