D=5x+1-(x+4)(x-9) eching

$$D = 5 x + 1 - ( x + 4 ) ( x - 9 )$$

D uchun yechish

$$D=37+10x-x^{2}$$

Yechim qadamlari

x+4 ga x-9 ni ko‘paytirish orqali distributiv xususiyatdan foydalaning va ifoda sifatida birlashtiring.

$$D=5x+1-\left(x^{2}-5x-36\right)$$

x^{2}-5x-36 teskarisini topish uchun har birining teskarisini toping.

$$D=5x+1-x^{2}+5x+36$$

10x ni olish uchun 5x va 5x ni birlashtirish.

$$D=10x+1-x^{2}+36$$

37 olish uchun 1 va 36'ni qo'shing.

$$D=10x+37-x^{2}$$

x uchun yechish (complex solution)

$$x=-\sqrt{62-D}+5$$

$$x=\sqrt{62-D}+5$$

x uchun yechish

$$x=-\sqrt{62-D}+5$$

$$x=\sqrt{62-D}+5\text{, }D\leq 62$$