zad.3. ROZWIĄŻ RÓWNANIE:
a)
(4-3x)²-3=(7-2x)(7+2x)+x²
b)
(3x-2)²=(x+1)²
c)
(x+3)²=(2x-1)²
d)
10(x-1)-(3x-1)²+9x²=(2x+1)²-(2x-3)(2x+3)+3
e)
(3x-2)²-(x+1)²=14x-9
f)
(x-2)²-(2x-5)²=x²-(2x-3)(2x+3)-2
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a)
(4 - 3x)² - 3 = (7 - 2x)(7 + 2x) + x²
16 - 24x + 9x² - 3 = 49 - 4x² + x²
13 - 24x + 9x² = 49 - 3x²
13 - 24x + 9x² - 49 + 3x² = 0
12x² - 24x - 36 = 0 /:12
x² - 2x - 3 = 0
Δ = 4 + 12 = 16; √Δ = 4
Odp. x₁ = - 1 i x₂ = 3
b)
(3x - 2)² = (x + 1)²
9x² - 12x + 4 = x² + 2x + 1
9x² - 12x + 4 - x² - 2x - 1 = 0
8x² - 14x + 3 = 0
Δ = 196 - 96 = 100; √Δ = 10
Odp. x₁ = ¼ i x₂ = 1½
c)
(x + 3)² = (2x - 1)²
x² + 6x + 9 = 4x² - 4x + 1
x² + 6x + 9 - 4x² + 4x - 1 = 0
-3x² + 10x + 8 = 0
Δ = 100 + 96 = 196; √Δ = 14
Odp. x₁ = 4 i x₂ = -⅔
d)
10(x - 1) - (3x - 1)² + 9x² = (2x + 1)² - (2x - 3)(2x + 3) + 3
10x - 10 - 9x² + 6x - 1 + 9x² = 4x² + 4x + 1 - 4x² + 9 + 3
16x - 11 = 4x + 13
16x - 4x = 13 + 11
12x = 24 /:12
x = 2
Odp. x = 2
e)
(3x - 2)² - (x + 1)² = 14x - 9
9x² - 12x + 4 - x² - 2x - 1 = 14x - 9
8x² - 14x + 3 = 14x - 9
8x² - 14x + 3 - 14x + 9 = 0
8x² - 28x + 12 = 0 \:4
2x² - 7x + 3 = 0
Δ = 49 - 24 = 25; √Δ = 5
Odp. x₁ = ½ i x₂ = 3
f)
(x - 2)² - (2x - 5)² = x² - (2x - 3)(2x + 3) - 2
x² - 4x + 4 - 4x² + 20x - 25 = x² - 4x² + 9 - 2
-3x² + 16x - 21 = - 3x² + 7
-3x² + 16x + 3x² = 7 + 21
16x = 28 /:16
Odp. x = 1¾