Answer:
1. HINDI KO PO ALAM YUNG ANSWER
2. 1/2 or x = -2
3. x=√30 or x=−√30
4. -1/5 or x= -5
5. x - 1/7 or 2/7 √2 or x = 1/7 + -2/7 √2
Step-by-step explanation:
2. 2x2+3x−2=0
For this equation: a=2, b=3, c=-2
2x2+3x+−2=0
Step 1: Use quadratic formula with a=2, b=3, c=-2.
x=
−b±√b2−4ac
2a
x=
−(3)±√(3)2−4(2)(−2)
2(2)
x=
−3±√25
4
x=
1
2
or x=−2
3. x2−42+12=0
Step 1: Simplify both sides of the equation.
x2−30=0
For this equation: a=1, b=0, c=-30
1x2+0x+−30=0
Step 2: Use quadratic formula with a=1, b=0, c=-30.
x=
−b±√b2−4ac
2a
x=
−(0)±√(0)2−4(1)(−30)
2(1)
x=
0±√120
2
x=√30 or x=−√30
4. 5x2+26x+5=0
For this equation: a=5, b=26, c=5
5x2+26x+5=0
Step 1: Use quadratic formula with a=5, b=26, c=5.
x=
−b±√b2−4ac
2a
x=
−(26)±√(26)2−4(5)(5)
2(5)
x=
−26±√576
10
x = -1/5 or x= -5
5. 7x2−2x=1
Step 1: Subtract 1 from both sides.
7x2−2x−1=1−1
7x2−2x−1=0
For this equation: a=7, b=-2, c=-1
7x2+−2x+−1=0
Step 2: Use quadratic formula with a=7, b=-2, c=-1.
x=
−b±√b2−4ac
2a
x=
−(−2)±√(−2)2−4(7)(−1)
2(7)
x=
2±√32
14
x=
1
7
+
2
7
√2 or x=
1
7
+
−2
7
√2
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