(x-7)^ + (-2x + 14)^ - 20 = 0
X1=5 tyle ma wyjść a X2=9
x-7)^ + (-2x + 14)^ - 20 = 0
x²-14x+49+4x²-56x+196-20=0
5x²-70x+225 =0====/:5
x²-14x+45=0
Δ=b²-4ac = 14²-4*45 = 196-180 = 16
√Δ= 4
x1 = (-b-√Δ)/2a = (14-4)/2 =5
x2 = (-b+√Δ)/2a = (14+4)/2 = 9
(x-7)² + (-2x+14)² - 20 = 0
x²-14x+49+4x²-56x+196-20 = 0
5x²-70x+225 = 0 /:5
x² - 14x + 225 = 0
Δ = b²-4ac = 196-180 = 16
√Δ = √16 = 4
x1 = (-b-√Δ)2a = (14-4)/2 = 5
Odp. x1 = 5 v x2 = 9
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x-7)^ + (-2x + 14)^ - 20 = 0
x²-14x+49+4x²-56x+196-20=0
5x²-70x+225 =0====/:5
x²-14x+45=0
Δ=b²-4ac = 14²-4*45 = 196-180 = 16
√Δ= 4
x1 = (-b-√Δ)/2a = (14-4)/2 =5
x2 = (-b+√Δ)/2a = (14+4)/2 = 9
(x-7)² + (-2x+14)² - 20 = 0
x²-14x+49+4x²-56x+196-20 = 0
5x²-70x+225 = 0 /:5
x² - 14x + 225 = 0
Δ = b²-4ac = 196-180 = 16
√Δ = √16 = 4
x1 = (-b-√Δ)2a = (14-4)/2 = 5
x2 = (-b+√Δ)/2a = (14+4)/2 = 9
Odp. x1 = 5 v x2 = 9