Question

×(×-8)=4(×-9)

Answer 1

×(×-8)=4(×-9)
x*-8x=4x-3

nie wiem czy to o to chodzilo wrazie co na dole zrobie jescze...:

×(×-8)=4(×-9)
x*-8x=4x-36
x*-8x-4x= -36
x*-12x= -36
(*)-kwadrat liczby

Answer 2

×(×-8)=4(×-9)
x² - 8x = 4x - 36
x² - 8x - 4x + 36 = 0
x² - 12x + 36 = 0
A=1
B=-12
C=36
Δ=b²-4ac
Δ = (-12)² - 4 *1*36
Δ= 122 - 144
Δ=0

x(zero) = -b/2a
x(zero) = 12/2*1
x(zero) = 6

(x-6)(x+6)=0