В)
5x² + 17x + 16 = 0
a =5, b = 17, c = 16
D= b² - 4ac
D= 17² - 4 * 5 * 16 = 289 - 120 = 169
-b +/- √D
X = _______
2a
-17 + √169 -17 + 13 -4 2
X₁ = _________ = _______ = ____ = ___
2 * 5 10 10 5
-17 - √169 -17 - 13 30
X₂ = _________ = ________ = ____ = 3
2 * 5 10 10
________________________________________________________
Г)
19x² - 23x + 5 = 0
a = 19, b = -23, c = 5
D = b² - 4ac
D = (-23)² - 4 * 19 * 5 = 529 - 380=149
-b +/- √D
X = _________
2a
- (-23) + √149 23 + √149
X₁ = ____________ = _________
2 * 19 38
- (-23) - √149 23 - √149
X₂= ____________ = _________
2 * 19 38
если что обращайся ))))
Решение
у = (3 - 2х)∧2
y(5) = (3 - 2*5)∧2 = (-7)∧2 = 49
y(-1/2) =( 3 - 2*(-1/2))∧2 = (3 + 1)∧2 = 4∧2 = 16
Ответ:
Объяснение:
10+5√3=5·2+5√3=5·(2+√3)
45-9√5=9·5-9√5=9·(5-√5)=9√5·(√5-1)