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Johan Bautista
Mathematics
4 August, 20:48
Factorise x2-3x-10
x2 is x squared
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Aubree Alexander
4 August, 20:59
0
X² - 3x - 10 = 0
(x - 5) (x + 2) = 0
x - 5 = 0 ⇒ x = 5
x + 2 = 0 ⇒ x = - 2
(x - 5) (x + 2) = 0
x (x + 2) - 5 (x + 2) = 0
x² + 2x - 5x - 10 = 0
x² - 3x - 10 = 0
x² ⇒ is x * x
Factors of 10 are:
1 x 10
2 x 5
-3 is indicative whether the factors will use a positive or negative sign.
to produce - 3 the factors of 10 will be 2 and - 5.
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Cristina Ewing
4 August, 21:02
0
X²-3x-10
1) solve this equation:
x²-3x-10=0
x=[3⁺₋√ (9+40) ] / 2 = (3⁺₋7) / 2
We have two solutions:
x₁ = (3-7) / 2=-4/2=-2 ⇒ (x+2)
x₂ = (3+7) = 10/2=5 ⇒ (x-5)
Therefore:
x²-3x-10 = (x+2) (x-5)
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