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Please help me to solve this equation 9x² - 72= 0 and 2x²+ 4x=3 using the quadratic formula

-b

x=-------------------

2a

1
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-b

x=-------------------

2a

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9x²-72=0 ; a=9, b=0, c=-72

x= -(0) √(0)²-4(9)(-72) / 2(9)

x=√2592 / 18

x=50.912 / 18

x≈ 2.828, -2.828

2x²+4x=3 ; a=2, b=4, c=-3

x= -(4)√(4)²- 4(2)(-3) / 2 (2)

x=-(4)√16+24 / 4

x=-(4)+ √40 / 4 ; x= -(4) - √40 /4

x=-4+ 6.325 / 4 ; x= -4-6.325/4

x=2.325/4 ; x= -10.325/4

x≈0.5813 ; x= -2.5813

PS : your formula is wrong. please review. :)