一元二次方程(8) 吾係太識做,吾亥幫忙教育我做?

1.
3x^2=48
x^2=16
x=4 or x=-4

2.
(x-5)^2=81
x-5=9 or x-5=-9
x=14 or x=-4

3.
(x-4)^2=36
x-4=6 or x-4=-6
x=10 or x=-2

4.
(x+7)^2-16=0
(x+7)^2=16
x+7=4 or x+7=-4
x=-3 or x=-11

5.
5(x-2)^2=10
(x-2)^2=2
x-2=√2 or x-2=-√2
x=2+√2 or x=2-√2

6.
(y+6)^2=9/25
y+6=3/5 or y+6=-3/5
y=-27/5 or y=-33/5

7.
z^2+16z+55=0
z=-5 or z=-11

8.
x^2-14x+49=0
(x-7)^2=0
x=7

9.
p^2-8p-2=0
p=(8+√72)/2 or p=(8-√72)/2
p=(8+2√18)/2 or p=(8-2√18)/2
p=4+√18 or p=4-√18

10.
5x^2+2x-7=0
x=1 or x=-1.4

1. 3X^2 =48
X^2=16
X=±4
3.(X-4)^2 =36
X-4=6 OR X-4=-6
X=10 OR -2
6.(Y+6)^2 =9/25
Y+6=3/5 OR -3/5
Y=-27/5 OR -33/5
8.X^2-14X+49=0
X=(-(-14)±√(-14)^2-4(1)(49))/2(1)
=7
HOPE CAN HELP U, OTHERS ARE THE SAME WAY TO DO