Question

solve the following quadratic equation 5x2 - 4x - 7 =0

Answer 1

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$5x^2$ - $4x$ - $7$ = $0$

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By quadratic formula :-

D = $b^2$ - 4(a)(c)

D = (-4)(-4) - 4(5)(-7)

D = 16 + 140

D = 156

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As,

x = (-b +- √D)/2

x = [-(-4) +- 12.48 ]/2

If :-

x = (4 - 12.48)/2

x = -8.48/2

x = -4.24

If :-

x = (4 + 12.48)/2

x = 16.48/2

x = 8.24...

Answer 2

Answer:

Step-by-step explanation: