Question

find the roots by quadratic formula 2xsquare +4x-5
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Answer 1

Step-by-step explanation:

2x²+4x-5 = 0

Comparing equation with general form ax²+bx+c= 0

a=2 b= 4 c= -5

x = -b ± ✓b²-4ac ÷ 2a

x = -4 ± ✓(4)²-4(2)(-5) ÷ 2*2

x = -4 ± ✓ 16+40 ÷4

x = -4 ± ✓ 56 ÷ 4

x = -4 + ✓56 ÷ 4 or x = -4 - ✓56 ÷ 4

x = -4 + 2✓14 ÷ 4 or x = -4 - 2✓14 ÷ 4

x = -1 + 2 ✓14 or x = -1 - 2 ✓ 14

x = ✓14 or x = -3✓14

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Answer 2

Step-by-step explanation:

quadratic formula = -b+-√bsquar-4ac\ 2a