Question

Solve 3x²+5x-7 by applying b²-4ac​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

$a = 3 \\ b = 5 \\ c= - 7 \\ {b}^{2} - 4 ac = {5}^{2} - 4 \times 3 \times - 7 \\ = > {b}^{2} - 4ac = 25 + 84 \\ = > {b}^{2} - 4 ac = 109 \\ x = \frac{ -b( + - ) \sqrt{ {b}^{2} - 4ac} }{2a} \\ = > x = \frac{ - 5( + - ) \sqrt{109} }{2 \times 3} \\ = > x = \frac{ - 5( + - )10.44}{6} \\ = > x = \frac{ - 5 + 10.44}{6} \: \: or \: \: \frac{ - 5 - 10.44}{6} \\ = > x = \frac{5.44}{6} \: \: or \: \: \frac{ - 15.44}{6} \\ = > x = 0.9 \: \: or \: \: - 2.57$