Question

17. (x - 5)(x + 3) = (x-7)(x + 4)
5x

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Answer 1

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

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

x^2+3x-5x-15=x^2+4x-7x-28

x^2-2x-15=x^2-3x-28

x^2-x^2-2x+3x=-28+15

0+x=-13

x= -13

i know till this much only

Answer 2

Answer:

Question :-

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

Required Answer :-

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

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

x^2 + 3x - 5x - 15 = x^2 + 4x - 7x - 28

- 2x - 15 = - 3x - 28

- 2x + 3x = - 28 + 15

x = - 13

Now,

5x = 5 x (-13)

= - 65

Hope it help you :)

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