Bài tập toán cơ bản số 31

Created by T. Madas
Question 20
Factorize each of the following quadratic expressions.

a) 3x 2 − 17 x + 20 = ( 3x − 5 )( x − 4 )
b) 2 x 2 − 3x − 5 = ( 2 x − 5 )( x + 1)
c) 5 x 2 − 7 x + 2 = ( 5 x − 2 )( x − 1)
d) 3x 2 + 13x + 12 = ( 3x + 4 )( x + 3)
e) 2 x 2 − 15 x + 27 = ( 2 x − 9 )( x − 3)
f) 7 x 2 − 9 x − 10 = ( 7 x + 5)( x − 2 )
g) 3x 2 − 13x + 14 = ( 3x − 7 )( x − 2 )
h) 2 x 2 + 9 x − 18 = ( 2 x − 3)( x + 6 )

Created by T. Madas


Created by T. Madas
Question 21
Factorize each of the following quadratic expressions.

a) 2 x 2 + 7 x − 30 = ( 2 x − 5 )( x + 6 )
b) 2 x 2 + 11x − 30 = ( 2 x + 15 )( x − 2 )
c) 4 x 2 + 8 x + 3 = ( 2 x + 1)( 2 x + 3)
d) 4 x 2 − 11x − 3 = ( 4 x + 1)( x − 3)
e) 4 x 2 + 4 x − 15 = ( 2 x + 5 )( 2 x − 3)
f) 4 x 2 − 7 x − 2 = ( 4 x + 1)( x − 2 )
g) 4 x 2 + 5 x − 6 = ( x + 2 )( 4 x − 3)
h) 4 x 2 − 8 x − 5 = ( 2 x − 5)( 2 x + 1)

Created by T. Madas