8x²-22x-21=0 solve by formula method
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Answered by
1
Answer:
Solve: 8x2-22x-21=0 by the factorisation method. Solution : We write, -22x=-28x+6x as 8x2×(-21)=-168x2=(-28x)×6x.
Answered by
3
Answer:
8x²-22x - 21
a = 8
b= -22
c= -21
D = √ b²-4ac
= √ (-22)²-4×(8)×(-21)
= √484+672
= √1156 = 34
quadratic formula
-b ± D/ 2a
-(-22)±34/2(8)
= 22±34/16
= 22+34/16. and. 24-36/16
= 56/16. and. -12/16
= 7/2. and. -3/4
Explanation:
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