samandeenzad samandeenzad

14-11-2020
Mathematics

contestada

(x + 10) cm
(x - 3) cm
The area of the rectangle is 48 cm².
Show that x satisfies the equation x2+ 7x - 78=0

Respuesta :

rms814278 rms814278

14-11-2020

Answer:

area a=lxb

48=(x+10)x(x-3)

48=x2-3x+10x-30

0=x2+7x-30-48

0=x2+7x-78

hence it is proved

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