Question

find and correct the erros
1/ 4(x-5)=4x-5
2/3x/3x+2=1/2
3/ (2a+3b)(a-b)=2a2-3b2

Answer 1

1). 4(x-5)= 4x-20

3). (2a+3b)(a-b) = 2a^2+3ab-2ab-3b^2=2a^2+ab-3b^2

Answer 2

x/4 - 5/4 = 4x -5

- 5/4+5 = -x/4 + 4x

-15/4 = 15x/4

x= -1

2/9x^2 +2 = 1/2

2/9x^2 = 1/2 - 2

2/9x^2 = -3/5

9x^2 = -6/5

x^2 = -6/5 /9

x = root -2/15