Step-by-step explanation:
1. x² + 4x - 4 = ( 3 )² + 4( 3) - 4
= ( 9 ) + ( 12 ) - 4
= ( 21 ) - 4
=( 17 )
Therefore x² + 4x - 4 = 17
2. 4a -3b 2c
+ 5a 8b 10c
-12a c
-3a 5b 13c
Sum = -3a + 5b + 13c
3. ( 10x + 12y ) - ( 3x - 18y )
= ( 10x + 12y ) + ( -3x + 18y )
= 10x + ( -3x) + 12y + 18y
= 7x + 30y
Therefore ( 10x + 12y ) - ( 3x - 18y ) = 7x + 30y
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Answers & Comments
Step-by-step explanation:
1. x² + 4x - 4 = ( 3 )² + 4( 3) - 4
= ( 9 ) + ( 12 ) - 4
= ( 21 ) - 4
=( 17 )
Therefore x² + 4x - 4 = 17
2. 4a -3b 2c
+ 5a 8b 10c
-12a c
-3a 5b 13c
Sum = -3a + 5b + 13c
3. ( 10x + 12y ) - ( 3x - 18y )
= ( 10x + 12y ) + ( -3x + 18y )
= 10x + ( -3x) + 12y + 18y
= 7x + 30y
Therefore ( 10x + 12y ) - ( 3x - 18y ) = 7x + 30y
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