Odpowiedzi

2009-12-21T23:13:47+01:00


W(√2)= -7(√2)⁴+(8a-1)(√2)²+3
-7(√2)⁴+(8a-1)(√2)²+3 =5
-28+2(8a-1)=2
16a-2=30
16a=32/:16
a=2
2009-12-21T23:18:11+01:00
W(x)= -7x⁴+(8a-1)x²+3
W(√₂)=5

5 = W(√2) = -7*2² +(8a-1)*2 + 3 =
= -28 + 16a - 2 + 3 = -27 * 16a

5 = -27 + 16a
32 = 16a
a = 2

W(x) = -7x⁴ +(8a-1)x² + 3 = -7x⁴ + 15x² + 3