3 x square minus 18 x minus 3 2 1 equal to 420
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Answer:
Step-by-step explanation:
3x²-18x-321= 0
==> 3(x²-6x-107)= 0
==> (x²-6x-107)= 0/3
x²-6x-107 = 0
BY QUADRITIC METHOD
a= 1 , b=-6 , c=-107
and formula = -b±√b²-4ac÷2a
==> -(-6) ±√(6)²-4(1)(-107) ÷ 2(1)
==> 6 ± √36+428 ÷ 2
==> 6± √464 ÷ 2
==> 6 ± 4√29 ÷ 2
==> 2( 3 ± 2√29) ÷ 2
==> 3± 2√29
==>x = 3+2√29 and 3-2√29
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