3.1 Factorise completely3.1.2 3x2 - 2x - 8
2 answers:
Answer:
3x² – 2x – 8
=> 3x² – 6x + 4x – 8
=> 3x( x – 2 ) + 4( x – 2 )
=> ( 3x + 4 ) ( x – 2 )
Therefore,
Either, 3x + 4 = 0
3x = - 4
x = - 4/3 (Ans)
And,
x – 2 = 0
x = 2 (Ans)
Answer:
(x - 2)(3x + 4)
Step-by-step explanation:
Given
3x² - 2x - 8
Consider the factors of the product of the coefficient of the x² term and the constant term which sum to give the coefficient of the x- term.
product = 3 × - 8 = - 24 and sum = - 2
The factors are - 6 and + 4
Use these factors to split the x- term
3x² - 6x + 4x - 8 ( factor the first/second and third/fourth terms )
= 3x(x - 2) + 4(x - 2) ← factor out (x - 2) from each term
= (x - 2)(3x + 4)
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Answer:
a. 2/3 = 0.67
b. 8/5 = 1.6
c. -5/2 = -2.5
d. 7/4 = 1.75
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Step-by-step explanation:
Convirtiendo las fracciones dadas a decimales, tenemos:
a. 2/3 = 0.67
b. 8/5 = 1.6
c. -5/2 = -2.5
d. 7/4 = 1.75
e. 9/2 = 4.5
f. -11/3 = -3.67
g. 13/5 = 2.6
h. -7/4 = -1.75
