Question

simplify the following expression and find their values at x = 3 i) x+7+3(x-2) ii) 2(3x - 1 ) +3 (2- x ) iii)( x(square) + x - 1 ) - (3x(square) - 2x - 5)

Answer 1

Step-by-step explanation:

i) =x+7+3x-6

=x-3x=-7-3+6

=2x=-10+6

=2x=-4

=x=-4/2

=-2

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Answer 2

Step-by-step explanation:

1. x+7+3(x-2)=3+7+3(3-2)=10+3×1=10+3=13
2. 2(3x-1)+3(2-x)=2(3×3-1)+3(2-3)=2(9-1)+3×(-1) =2×8-3=16-3=13
3. (x^2+x-1)-(3x^2-2x-5)=(3^2+3-1)-(3×3-2×3-5)=(9+2)-(9-6-5)=11×(9-11)=11×(-2)= -22