Question

28. 2 - 7x3+7x
1-5x
4+5x​

Answer 1

Answer:

1/2

Step-by-step explanation:

It is given that ,

( 2 - 7x )/( 1 - 5x ) = ( 3 + 7x )/( 4 + 5x )

Do the cross multiplication ,

( 2 - 7x )( 4 + 5x ) = ( 3 + 7x )( 1 - 5x )

2(4 + 5x)-7x(4+ 5x)=3(1-5x)+7x( 1 - 5x)

8+10x - 28x - 35x² = 3 - 15x+7x - 35x²

8 - 18x - 35x² = 3 - 8x - 35x²

8 - 18x = 3 - 8x

8 - 3 = - 8x + 18x

5 = 10x

5/10 = x

1/2 = x

Therefore ,

x = 1/2

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Answer 2

(4x2 - 2x) - (-5x2 - 8x)

= 4x2 - 2x + 5x2 + 8x.

= 4x2 + 5x2 - 2x + 8x.

= 9x2 + 6x.

= 3x(3x + 2).

Answer: 3x(3x + 2)