Question

multiply them.......... ​

Answer 1

(50-2x)×(40-2x)

=2000+4x

-4x=2000

x=2000/-4

= -500 ohk

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Answer 2

$\huge\purple{Required \: Answer :}$

• $x = 20$
• $x = 25$

$\huge\red{Explanation :}$

$= (50 - 2x)(40 - 2x) \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ = 50(40 - 2x) - 2x(40 - 2x) \\ = 2000 - 100x - 80x + 4 {x}^{2} \: \: \\ = 4 {x}^{2} - 180x + 2000 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:$

Divide Above Equation by 4 ,

$= {x}^{2} - 45x + 500 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ = {x}^{2} - 20x - 25x + 500 \: \: \: \: \: \: \: \\ = ( {x}^{2} - 20x) - (25x - 500) \\ = x(x - 20) - 25(x - 20) \: \: \: \: \\ = (x - 25)(x - 20) \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ x = 25 \: or \: x = 20 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:$

$\huge\bf{Thanks : ❤}$