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Scorpion4ik [409]
3 years ago
9

BRAINLIEST ASAP!!!

Mathematics
1 answer:
Anarel [89]3 years ago
5 0
Part A: the radicand is the same as the discriminant, therefore is b2 - 4ac
In 9x^2 - 16x + 60 = 0, a = 9, b = -16, c = 60
so b2 - 4ac =
{b}^{2}  - 4ac =  {( - 16)}^{2}  - 4(9)(60) \\  = 256 - 2160 = 1904 \\  \sqrt{1904}  =  + 43.63 \: and \:  - 43.63

Part B: Solve 4x^2 + 8x - 5 = 0
What would make 8? (5×2)-2 = 8, so:
(2x+5)(2x-1) = 0
2x+5 = 0
2x = -5
x = -5/2
2x-1 = 0
2x = 1
x = +1/2
So the solutions are: -5/2, +1/2
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