Mizakiviz
Answered

guuuuuuuuuuys help me can u give me the equation of the , the area of the rectangle whose lenght is (x+4) and the width is (x-3) is 30

Sagot :

Riza1viz
[tex] lenght:\ l= (x+4)\\ width: \ w=(x-3) \\ Area : \ A=30 \\\\A=l\cdot w\\\\30=(x+4)(x-3) \\30= x^2-3x+4x-12 \\x^2+x -12-30=0\\x^2+x-42=0\\x^2+7x-6x-42 =0 \\x(x +7 )-6(x+7 )=0\\(x-6)(x+7)=0\\x-6=0 \ \ or \ \ x+7=0\\\\x=6 \ \ or \ \x=-7 < 0 [/tex]

[tex]lenght:\ l= (9x+4)=(6+4)=10\\ width: \ w=(x-3) =(6-3)=3[/tex]


Joooownaviz
X=6 or X= -7

(x+4)(x-3)=30
x2+x-12=30
x2+x-12-30=0
x2+x-42=0
(x+7)(x-6)=0
x= -7 / x=6

-7+4= -3      -7-3= -10    L= -3   W= -10  Area=LxW -3 x -10= 30