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Harlamova29_29 [7]
3 years ago
9

8. f(x) = x² + 3x - 2.

Mathematics
1 answer:
Ivahew [28]3 years ago
5 0

Answer:

(a) x² − 13x + 4

(b) x² − 26x + 153

Step-by-step explanation:

f(x) = x² + 3x − 2

a + ß = -3

aß = -2

(a) (x − a²) (x − ß²)

x² − (a² + ß²) x + a²ß²

x² − ((a + ß)² − 2aß) x + a²ß²

x² − ((-3)² − 2(-2)) x + (-2)²

x² − (9 + 4) x + 4

x² − 13x + 4

(b) (x − (a − ß)²) (x − (a + ß)²)

x² − ((a − ß)² + (a + ß)²) x + (a − ß)²(a + ß)²

x² − (a² − 2aß + ß² + a² + 2aß + ß²) x + (a² − 2aß + ß²)(a + ß)²

x² − (2a² + 2ß²) x + (a² − 2aß + ß²)(a + ß)²

x² − 2(a² + ß²) x + (a² − 2aß + ß²)(a + ß)²

x² − 2((a + ß)² − 2aß) x + ((a + ß)² − 4aß)(a + ß)²

x² − 2((-3)² − 2(-2)) x + ((-3)² − 4(-2))(-3)²

x² − 2(9 + 4) x + (9 + 8)(9)

x² − 26x + 153

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