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vlabodo [156]
3 years ago
8

Can someone explain how these equal 5 and -5 please

Mathematics
1 answer:
uysha [10]3 years ago
6 0
I'm not sure how you obtained -5 as your answer but this is the mathematical explanation. hope this helps!
{x}^{2}  + 3x = 40 \\  {x}^{2}  + 3x - 40 = 0 \\(x + 8)(x - 5) = 0 \\ x =  - 8 \\ x = 5
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