Chapter 10 QuadratiC EQuations 371
- 2x^2 = 9
- –3x^2 + 4x + 1 = 0
- 9x^2 – x = 10
- 10x^2 – 5x = 0
- 01 ..xx^2 – 0111 – = 0
9.^1
3
1
6
1
8
xx^2 + – = 0
- 80x^2 – 16x – 32 = 0
- 18x^2 + 39x + 20 = 0
- x^2 + 10x + 25 = 0
✔SOLUTIONS
- xx
x
(^2530)
(^55452512)
2
51
−+=
=−− ±−−()() (1)(3)= ±−= ±
2(1)
(^233)
2
- 460
(^114461196197)
2
2
xx
x
+−=
=−± −−()()=−± −− =−±
2(4)
()
8 88
- 732320
3347 2
22
2
xx xx
x
+= +−=
=−± −−
(Equivalentto7
)(
)
( ))
2(7)
=−± −−^39 ()^56 =−±
14
365
14
- 29 290
04
22
2
xx
x
=−=
=−± −−=
(Equivalentto)
0(2)(9)
2(2)
0072
4
72
4
36 2
4
62
4
32
2
±−− =± =±⋅
=± =±
()
- −++=
=−± −−
−
=−± −−
−
=
3410
4443
3
41612
6
2
2
xx
x ( )(1)
2( )
() 4428
6
447
6
427
6
727
3
±
−
=−± ⋅
−
=−±
−
=−±
−
2(2)= ±
6