5. Simplify the expressions and find the value when x = -2. (a) 3(x + 5) - X - 7 (b) x + 5 - 2(x - 5) (c) 2(4x - 1) + 4(2x + 1) 6. What should be the value of p if the value of 3x² + 4x - p is 5, when (a) x = -1, (b) x = 1? 7. Find the value of the expression a - b3 + 3ab(a - b) when a = -3, b = 1.
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5 . a) 3(-2 + 5) -(-2) -7
3(3) -5
= 9 - 5
= 4
b) -2+5-2(-2-5)
3+4+10
= 17
c) 2( 4(-2) -1 ) + 4( 2(-2) +1)
2(-9) + 4( -3)
-18 + (-12)
= -30
6) 3x² + 4x - p = 5 ( x = -1)
3(-1) ² + 4(-1) -p =5
3 -4 -p = 5
-1 -p = 5
p = -6
b ) 3x² + 4x - p = 5 ( x = 1 )
3(1) ² + 4(1) - p = 5
3 + 4 - p = 5
7 - p = 5
p = 7 - 5
p = 2
7 ) a - b³ + 3ab( a - b) ( a= -3 , b = 1)
-3-1+3(-3) (1) (-3-1)
-4 -9(-4)
-4 + 36
32
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